[seqfan] Re: Today's XKCD

[Ami Eldar]

The true explanation for the phone number 8675309 is not (7^(e - 1/e) -
9)*Pi^2, but that it is a lesser of twin primes which has 7 distinct
digits, which is also a prime-indexed prime, a prime of the form 4p+1 with
p being a prime, prime p such that 2p+3 is also a prime, and an hypotenuse
of a primitive pythagorean triple.

On Sat, Jul 7, 2018 at 11:13 PM, Daniel via SeqFan <seqfan at list.seqfan.eu>
wrote:

>  He can also claim the aforementioned A182369.
>
>     On Friday, July 6, 2018, 10:33:43 PM GMT+3, Charles Greathouse <
> charles.greathouse at case.edu> wrote:
>
>  For what it's worth, although he hasn't (to my knowledge) actually
> submitted any sequences himself, Randall Munroe has a few sequences he
> could reasonably claim in the OEIS:
>
> A129336, Digital clock semiprimes, submitted by Jonathan Vos Post and
> inspired by https://xkcd.com/247/
>
> A166079, submitted by yours truly and inspired by
> http://blag.xkcd.com/2009/09/02/urinal-protocol-vulnerability/
>
> Charles Greathouse
> Case Western Reserve University
>
>
> On Fri, Jul 6, 2018 at 3:19 PM Charles Greathouse <
> charles.greathouse at case.edu> wrote:
>
> > Some of these aren't too far off the mark:
> > A091967, A053873, A053169, A250221, A031214 (OEIS self-reference)
> > A182369, A157989 (phone numbers)
> > A001489 (we can't do the order type of all the integers in descending
> > order, but here's half)
> > A010734 (all 9s)
> >
> > Charles Greathouse
> > Case Western Reserve University
> >
> >
> > On Fri, Jul 6, 2018 at 3:14 PM Charles Greathouse <
> > charles.greathouse at case.edu> wrote:
> >
> >> Rejected OEIS sequences:
> >> https://xkcd.com/2016/
> >>
> >> Charles Greathouse
> >> Case Western Reserve University
> >>
> >
>
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