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Robert A. Heinlein would turn 119 today, as he was born on the very
memorable date 7/7/07.
--
Keith F. Lynch - http://keithlynch.net/
Please see http://keithlynch.net/email.html before emailing me.
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On Tue, 7 Jul 2026 14:17:47 -0000 (UTC), Keith F. Lynch wrote:

Robert A. Heinlein would turn 119 today, as he was born on the very
memorable date 7/7/07.

1907 is a prime number, too. But 2007 is not.

Looking for year numbers 19xx where 19xx and 20xx are both prime,
there are only

1987 + 100 = 2087
1999 + 100 = 2099

A lot more if you go back a century:

1801 + 100 = 1901
1831 + 100 = 1931
1849 + 100 = 1949
1873 + 100 = 1973
1879 + 100 = 1979

There are no pairs of primes with a difference of 119 between them.
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Lawrence D\377Oliveiro <ldo@nz.invalid> wrote:

Keith F. Lynch wrote:

Robert A. Heinlein would turn 119 today, as he was born on the very
memorable date 7/7/07.

1907 is a prime number, too. But 2007 is not.

Yes, 7 and 1907 are prime numbers, and 2007 is not.
But, unfortunately, 119 is also not prime.

There are no pairs of primes with a difference of 119 between them.

True. It's still not known whether there are infinitely many primes
with a difference of 2 between them. Or whether every even number is
the sum of two primes. Or whether the Riemann Conjecture is true.
Much about primes still remains mysterious, even 23 centuries after
Euclid proved that there are infinitely many primes. Or 2 centuries
after Felix Mendelssohn's brother in law proved that there are
infinitely many primes congruent to A mod B whenever A and B share
no factors.

Also not prime is the 377 in your name. What is that character
intended to look like, anyway? Thanks.
--
Keith F. Lynch - http://keithlynch.net/
Please see http://keithlynch.net/email.html before emailing me.
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In Message-ID:<112k7sk$3854h$4@dont-email.me>,
Lawrence D Oliveiro <ldo@nz.invalid> wrote:

There are no pairs of primes with a difference of 119 between them.

I assume that's a joke.

There are no pairs of primes with any odd difference between them,
unless one of them is 2 (e.g. there IS a pair with a difference of
125).
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In article <112k7sk$3854h$4@dont-email.me>,
Lawrence D Oliveiro <ldo@nz.invalid> wrote:

There are no pairs of primes with a difference of 119 between them.

[Hal Heydt]
Trivially obvious. All primes greater than 2 are odd numbers.
119 is an odd number, therefore any prime--other that 2--plus 119
must be an even number, and, therefore not a prime. Since 2+119
= 121, which is 11^2, and therefore not a prime, the initial
statement is true.
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From Newsgroup: rec.arts.sf.fandom

On Wed, 8 Jul 2026 01:26:42 -0000 (UTC), Keith F. Lynch wrote:

It's still not known whether there are infinitely many primes
with a difference of 2 between them.

Speaking of which, hererCOs an interesting sequence of primes:

1889, 2017, 2081, 2113, 2129, 2137, 2141, 2143
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On Wed, 8 Jul 2026 06:43:30 -0000 (UTC), I wrote:

On Wed, 8 Jul 2026 01:26:42 -0000 (UTC), Keith F. Lynch wrote:

It's still not known whether there are infinitely many primes with
a difference of 2 between them.

Speaking of which, hererCOs an interesting sequence of primes:

1889, 2017, 2081, 2113, 2129, 2137, 2141, 2143

Going the other way:

1607, 1609, 1613, 1621, 1637, 1669, 1733, 1861

Between 1000 and 9999, there is one other sequence with decreasing
steps:

5399, 5527, 5591, 5623, 5639, 5647, 5651, 5653

and none with increasing steps.
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On Wed, 8 Jul 2026 06:43:30 -0000 (UTC), Lawrence DrCOOliveiro wrote:

Speaking of which, hererCOs an interesting sequence of primes:

How about equal steps; couldnrCOt find any starting between 1000 and
9999 with steps equal to a power of 2, but other numbers produce
interesting results, like these:

1669, 2029, 2389, 2749, 3109, 3469
9187, 9547, 9907, 10267, 10627, 10987

Taking the lower limit down to 2 produced this slightly longer
sequence:

49, 409, 769, 1129, 1489, 1849, 2209
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From Newsgroup: rec.arts.sf.fandom

On Wed, 8 Jul 2026 06:43:30 -0000 (UTC), I wrote:

Speaking of which, hererCOs an interesting sequence of primes:

How about equal steps; couldnrCOt find any starting between 1000 and
9999 with steps equal to a power of 2, but other numbers produce
interesting results, like these:

1669, 2029, 2389, 2749, 3109, 3469
9187, 9547, 9907, 10267, 10627, 10987
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Someone Else <someone.else@example.com.invalid> wrote:

In Message-ID:<112k7sk$3854h$4@dont-email.me>,
Lawrence D Oliveiro <ldo@nz.invalid> wrote:

There are no pairs of primes with a difference of 119 between them.

I assume that's a joke.

There are no pairs of primes with any odd difference between them,
unless one of them is 2 (e.g. there IS a pair with a difference of
125).

What about 117 and -2?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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Scott Dorsey <kludge@panix.com> wrote:

Someone Else <someone.else@example.com.invalid> wrote:

There are no pairs of primes with any odd difference between them,
unless one of them is 2 (e.g. there IS a pair with a difference of
125).

Correct.

What about 117 and -2?

Negative numbers aren't usually considered prime.

And 117 isn't prime. It's 3*3*13.

Negative numbers can be gaussian primes. But -2 is not a gaussian
prime either.
--
Keith F. Lynch - http://keithlynch.net/
Please see http://keithlynch.net/email.html before emailing me.
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