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 A176903 #15 Mar 30 2012 18:40:52
%S A176903 3,7,13,61,2521,55441,4324321,367567201,6064949221531201,
%T A176903 9200527969062830401,37188534050951960476801,
%U A176903 8201519488959040182625924708238885435575055666675808001
%N A176903 Primes of the form colossally abundant number + 1.
%C A176903 The next term is too large to be displayed here.
%C A176903 The n-th colossally abundant number + 1 is prime for n = 1, 2, 3, 4, 7, 9, 12, 14, 21, 23, 26, 46, 65, 69, 143, 147.
%F A176903 {A004490(i) + 1} INTERSECTION A000040.
%e A176903 A004490(12) = 4324320, and 4324320 + 1 = 4324321 is prime.
%e A176903 A004490(46) + 1 = 8201519488959040182625924708238885435575055666675808001 is prime.
%Y A176903 Cf. A000040, A004490, A136669, A181561, A181562.
%K A176903 nonn
%O A176903 1,1
%A A176903 _Jonathan Vos Post_, Jan 31 2011