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 A102342 #19 Feb 03 2024 00:49:57 %S A102342 0,1,3,4,6,9,10,12,13,15,16,19,22,25,27,30,31,33,34,36,39,45,46,48,54, %T A102342 55,57,58,60,61,64,67,72,75,78,79,82,85,87,88,90,93,94,96,97,99,108, %U A102342 109,111,118,121,123,127,129,130,132,136,142,144,148,156,159,160,162,163 %N A102342 Numbers k such that 10k + 7 is prime. %e A102342 10*1 + 7 = 17 (prime); %e A102342 10*48 + 7 = 487 (prime); %e A102342 10*99 + 7 = 997 (prime). %t A102342 Select[Range[0, 170], PrimeQ[10# + 7] &] (* _Ray Chandler_, Nov 07 2006 *) %o A102342 (Magma) [n: n in [0..3000]| IsPrime(10*n+7)]; // _Vincenzo Librandi_, Apr 06 2011 %o A102342 (PARI) is(n)=isprime(10*n+7) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A102342 Cf. A030432, A049509. %K A102342 nonn %O A102342 1,3 %A A102342 _Parthasarathy Nambi_, Feb 20 2005 %E A102342 Edited and extended by _Ray Chandler_, Nov 07 2006