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 A132190 #15 Sep 08 2024 19:26:21 %S A132190 2,4,8,10,12,14,18,20,22,26,30,34,44,46,58,66,68,70,74,76,78,84,90,96, %T A132190 100,106,108,110,120,128,134,140,146,152,154,156,158,162,164,168,174, %U A132190 184,186,188,196,200,202,210,216,228,232,238,250,252,260,262,264,268 %N A132190 Numbers n such that 7*n^2 + 1 is prime. %e A132190 If n=2 then 7*n^2 + 1 = 29 (prime). %e A132190 If n=100 then 7*n^2 + 1 = 70001 (prime). %t A132190 Select[Range[300], PrimeQ[7*#^2 + 1] &] (* _Stefan Steinerberger_, Jan 02 2008 *) %o A132190 (Magma) [ n: n in [0..500] | IsPrime(7*n^2 + 1) ]; // _Vincenzo Librandi_, Jan 31 2011 %o A132190 (PARI) is(n)=isprime(7*n^2+1) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A132190 Cf. A111051. %K A132190 nonn,easy %O A132190 1,1 %A A132190 _Parthasarathy Nambi_, Nov 05 2007 %E A132190 More terms from _Stefan Steinerberger_, Jan 02 2008