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 A157611 #12 Nov 15 2013 20:10:47 %S A157611 3,4,6,7,10,12,13,19,23,26,32,63,95,150,324,449,1969,2988,6199,8093, %T A157611 23393,25427,34685,35076,44171,45624,83357,116404 %N A157611 Numbers n such that the n-th tribonacci number as defined by A000213 is prime. %C A157611 The next term is greater than 10000. %C A157611 a(29) > 2*10^5. - _Robert Price_, Nov 15 2013 %Y A157611 Cf. A000213, A056816. %K A157611 nonn %O A157611 1,1 %A A157611 _Dmitry Kamenetsky_, Mar 03 2009 %E A157611 a(21)-a(28) from _Robert Price_, Nov 15 2013