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 A178322 #13 Mar 20 2015 19:16:41 %S A178322 1,2,5,29,30,108,679,4478,8736,17000,22427,22731 %N A178322 Numbers n such that 156/101*(10^(4n)-1)-1 is prime. %C A178322 If n is in the sequence then m=91*(156/101*(10^(4n)-1)-1) is a term of A072394. Namely if n is a term of this sequence then for m=1/101*(14196*10^(4n)-23387), we have sigma(m)=reversal(m)-m (see comment lines of A072394). %C A178322 Numbers corresponding to the larger terms are probable primes. %C A178322 Next term exceeds 3500. - _Robert G. Wilson v_, Aug 08 2011. %C A178322 a(13) > 40000. - _Robert Price_, May 23 2014 %t A178322 Select[Range[700], PrimeQ[156/101*(10^(4 #) - 1) - 1] &] %Y A178322 Cf. A072394, A178321. %K A178322 more,nonn %O A178322 1,2 %A A178322 _Farideh Firoozbakht_, May 26 2010 %E A178322 a(8)-a(12) from _Robert Price_, May 23 2014