This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A171264 #10 Mar 19 2018 06:43:22 %S A171264 30823866178561,796928461056001,1802582780370364661761, %T A171264 2827987212986831882236723201, %U A171264 68688966922031309945174465761834751373920047004215278394826366933532673 %N A171264 Primes of the form 1 + 5-multiperfect numbers. %C A171264 A subsequence of A093034. If p is a term of this sequence then for each positive integer k, x=p^k is a solution for the equation sigma(phi(x))=5(x-1). See comment lines of the sequence A093034. %e A171264 p=30823866178561 is prime and sigma(p-1)/(p-1)=5, so p is in the sequence. %Y A171264 Cf. A027687, A093034, A171263, A171265. %K A171264 fini,full,nonn %O A171264 1,1 %A A171264 _M. F. Hasler_ and _Farideh Firoozbakht_, Apr 15 2010