OFFSET
1,1
COMMENTS
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..2500 from Charles R Greathouse IV)
Eric Weisstein's World of Mathematics, Ramanujan's Tau Function.
EXAMPLE
MATHEMATICA
Select[Range[30000], Mod[DivisorSigma[11, #1], 691]==Mod[DivisorSigma[11, #1+1], 691]&]
PROG
(PARI) is(n)=(ramanujantau(n)-ramanujantau(n+1))%691==0 \\ Charles R Greathouse IV, Feb 08 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Aug 18 2006
STATUS
approved