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 A134616 #10 Apr 09 2025 20:24:56 %S A134616 6,10,12,14,26,34,40,45,54,56,63,74,75,80,90,94,96,99,104,105,126,134, %T A134616 146,147,152,153,171,176,184,194,206,207,231,232,234,250,261,273,274, %U A134616 296,300,306,326,328,334,342,344,345,350,357,363,369,376,384,386,387 %N A134616 Numbers such that the sum of squares of their prime factors (taken with multiplicity) is a prime. %H A134616 Hieronymus Fischer, <a href="/A134616/b134616.txt">Table of n, a(n) for n = 1..10000</a> %e A134616 a(2)=10, since 10=2*5 and 2^2+5^2=29 which is prime. %t A134616 f[{a_,b_}]:=Table[a,b];Select[Range[2,387],PrimeQ[ Total[Flatten[(f/@FactorInteger[#])^2]] ]&] (* _James C. McMahon_, Apr 09 2025 *) %Y A134616 Cf. A001597, A025475, A134333, A134344, A134376. %Y A134616 Cf. A134600, A134602, A134605, A134608, A134612, A134619, A134621. %K A134616 nonn %O A134616 1,1 %A A134616 _Hieronymus Fischer_, Nov 11 2007 %E A134616 Minor edits by the author, May 06 2013