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 A261456 #25 Sep 08 2022 08:46:13 %S A261456 3,5,7,19,23,29,37,41,43,47,59,61,67,73,83,89,109,113,127,131,137,139, %T A261456 149,151,157,163,167,173,179,181,191,193,197,199,223,227,229,239,241, %U A261456 257,263,269,271,281,283,293,307,311,313,317,331,337,347,353,359,373 %N A261456 Prime numbers whose sum of digits is not a power of 2. %C A261456 Complement of A068807 with respect to primes. %H A261456 Felix Fröhlich, <a href="/A261456/b261456.txt">Table of n, a(n) for n = 1..10000</a> %t A261456 Select[Prime@Range[80], !IntegerQ[Log[2, Plus@@IntegerDigits[#]]] &] (* _Vincenzo Librandi_, Aug 19 2015 *) %o A261456 (PARI) lista(nn) = forprime (n=1, nn, sd = sumdigits(n); if (2^valuation(sd,2) != sd, print1(n, ", "))); \\ _Michel Marcus_, Aug 19 2015 %o A261456 (Magma) [p: p in PrimesUpTo(400) | not PrimeDivisors(s) eq [2] where s is &+Intseq(p)]; // _Vincenzo Librandi_, Aug 19 2015 %Y A261456 Cf. A007605, A068807. %K A261456 nonn,base %O A261456 1,1 %A A261456 _Altug Alkan_, Aug 19 2015