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 A048526 #10 Nov 12 2018 12:42:39 %S A048526 37783,85601,259631,268721,350941,371939,378901,516521,665111,733331, %T A048526 883331,967781,1047929,1056521,1081721,1258811,1427411,1480573, %U A048526 1515929,1584901,1614929,1842131,1875311,1885981,2027801,2044873,2450531 %N A048526 Primes for which only four iterations of 'Prime plus its digit sum equals a prime' are possible. %H A048526 Lars Blomberg, <a href="/A048526/b048526.txt">Table of n, a(n) for n = 1..10000</a> %e A048526 prime 37783 -> 37783 + (3+7+7+8+3) = prime 37811 -> 37811 + (3+7+8+1+1) = prime 37831 -> 37831 + (3+7+8+3+1) = prime 37853 -> 37853 + (3+7+8+5+3) = prime 37879 -> next iteration yields composite 37913. %Y A048526 Cf. A047791, A048519. %K A048526 nonn,base %O A048526 1,1 %A A048526 _Patrick De Geest_, May 15 1999 %E A048526 Changed offset by _Lars Blomberg_, Dec 05 2013