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simonlc · 2022-01-21 08:47:16

It's not a 5 digit prime.

khedoros | karma 1031 | avg karma 1.7 · | 2016-02-06 04:49:37

But it wouldn't be a prime.

jacquesm | karma 227883 | avg karma 3.76 · | 2014-07-30 14:39:26+00:00

It's not "Illegal number" it is "Illegal prime number".

Koshkin | karma 7543 | avg karma 1.41 · | 2018-06-29 19:14:33

This number is prime.

tlholaday | karma 466 | avg karma 1.82 · | 2022-01-21 08:42:19

00003 is not a prime?

stcredzero | karma 37049 | avg karma 2.13 · | 2011-05-11 11:53:17

Whoops, wrong single digit prime number.

VMG | karma 8688 | avg karma 3.0 · | 2023-08-09 09:23:29

> It's relatively easy to verify whether a specific number is prime or not

Only the "not" part is easy

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NickM | karma 2544 | avg karma 4.43 · | 2022-01-21 09:17:24

I don't think it's specific to "the prime-enthusiast community". Most people would look at you oddly if you claimed that 3 is a five-digit number.

iso1631 | karma 5532 | avg karma 1.87 · | 2022-01-21 11:43:17

Looks like there's 8,363 5 digit primes, from 10007 to 99991, so about 1 in 11

loeg | karma 21759 | avg karma 2.57 · | 2018-01-03 20:24:26+00:00

It doesn't, really. It's just a novel prime that happens to be a Mersenne number (2^n - 1).

noobie | karma 984 | avg karma 4.43 · | 2016-03-08 16:20:25+00:00

For me it's 17, 17*3= 51 which at a first quick glance looks like a prime, up until you add the digits and it's clear of course.

OscarCunningham | karma 4629 | avg karma 3.16 · | 2018-04-27 07:51:25

That's not really true. There are loads of large primes (way more than you could store), so they're not all notable.

josephcsible | karma 22500 | avg karma 3.06 · | 2021-07-16 00:39:20

After lots of 2-digit numbers ending in 5 came up, my brain went on autopilot thinking "any number that ends in 5 is not a prime". I lost when 5 came up.

HocusLocus | karma 493 | avg karma 1.32 · | 2024-04-28 03:57:44

31337 and 1337 are prime. Doesn't get any more 1337 than that!

metalliqaz | karma 5420 | avg karma 3.01 · | 2022-01-21 09:14:28

So are people just really good with numbers? I don't know any 5 digit primes nor do I know a way to calculate them on the fly.

jra101 | karma 420 | avg karma 4.42 · | 2014-03-13 14:35:57+00:00

No longer a prime number :(

mangecoeur | karma 2005 | avg karma 7.04 · | 2018-11-04 11:33:31+00:00

Sub-prime :P

raverbashing | karma 22421 | avg karma 1.64 · | 2018-01-03 20:34:23+00:00

The relevant thing is not that's a prime (it's pretty trivial to find one), but a Mersenne Prime

Primality testing is not trivial at those number sizes

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GoblinSlayer | karma 1313 | avg karma 0.44 · | 2024-04-16 09:19:53

Shouldn't there be another close enough prime? Like 2^510-1 or 2^511-19?

ColinWright | karma 127421 | avg karma 8.1 · | 2015-11-02 12:51:58+00:00

Especially impressive, given that 56153 is not prime ...

(you might want to fix the title)

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