This (in longer form) disappeared two days ago. ---------- Forwarded message ---------- From: Bill Gosper <billgosper@gmail.com> Date: Thu, Oct 30, 2014 at 11:15 PM Subject: Re: [math-fun] Ménage primes To: math-fun@mailman.xmission.com On 2014-10-30 19:24, Adam P. Goucher wrote:
Here's a problem to be added to Ed Pegg's list of prize puzzles: find another ménage prime.
https://cp4space.wordpress.com/2014/10/31/menage-primes/
So far, only five such primes are known (although I haven't searched beyond n = 10000):
M(4) = 5 M(5) = 13 M(13) = 775596313 M(53) = 567525075138663383127158192994765939404930668817780601409606090331861 M(8645) = [22721955113931<<30252>>711928404157613]
Happy Halloween!
Sincerely,
Adam P. Goucher
A000179: 1, 0, 0, 1, 2, 13, 80, 579, 4738, 43387, 439792,... In[319]:= Table[Round[2*n/E^2*BesselK[n, 2]], {n, 9}] Out[319]= {0, 0, 1, 2, 13, 80, 579, 4738, 43387} BesselK!?! --rwg Hallowe'en: Yesterday, Jake's Pizza in Saratoga in the window had a certificate of approval from the Santa Clara County Board of Health. Inside: wall to wall spiders on massive fake webs.