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 A176545 #25 Aug 01 2025 19:41:16 %S A176545 2,9,11,12,14,17,21,24,26,39,44,47,59,77,86,87,89,101,116,117,122,126, %T A176545 131,137,147,152,161,164,177,179,189,191,192,201,212,219,222,231,249, %U A176545 257,261,264,284,287,296,306,317,326,329,336,347,369,387,389,411,417 %N A176545 Numbers k>0 such that 2*k^2+14*k+5 is prime. %C A176545 Conjecture: If p = 2*k^2 + 14*k + 5 then 2^p - 1 is not prime. %H A176545 Vincenzo Librandi, <a href="/A176545/b176545.txt">Table of n, a(n) for n = 1..1000</a> %t A176545 Select[Range[500], PrimeQ[2#^2 + 14# + 5] &] (* _Harvey P. Dale_, Jan 09 2011 *) %o A176545 (Magma) [n: n in [1..1000]| IsPrime(2*n^2+14*n+5)]; %Y A176545 Cf. A154577 (Primes of the form 2n^2 + 14n + 5), A144562(Triangle read by rows where T(m, n) = 2m*n + m + n - 1). %K A176545 nonn,easy %O A176545 1,1 %A A176545 _Vincenzo Librandi_, Apr 20 2010