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 A252790 #20 Sep 08 2022 08:46:10 %S A252790 1,4,8,17,144,154,298,572,732 %N A252790 Numbers m such that 5^m + m is a semiprime. %C A252790 a(8) > 413. - _Carl Schildkraut_, Aug 14 2015 %C A252790 a(10) >= 766. - _Kevin P. Thompson_, May 01 2022 %H A252790 FactorDB, <a href="http://factordb.com/index.php?id=1100000000212735410">Status of 5^766+766</a> %e A252790 1 is in this sequence because 5^1+1 = 2*3 is semiprime. %e A252790 8 is in this sequence because 5^8+8 = 3*130211 and these two factors are prime. %t A252790 Select[Range[413], PrimeOmega[5^# + #]==2 &] %o A252790 (Magma) IsSemiprime:=func<i | &+[d[2]: d in Factorization(i)] eq 2>; [m: m in [1..110] | IsSemiprime(s) where s is 5^m+m]; %o A252790 (PARI) main(m)=select(m->bigomega(5^m + m)==2,vector(m,i,i)); \\ _Anders Hellström_, Aug 14 2015 %Y A252790 Cf. similar sequences listed in A252788. %Y A252790 Cf. A252658. %K A252790 nonn,more %O A252790 1,2 %A A252790 _Vincenzo Librandi_, Dec 24 2014 %E A252790 a(5)-a(7) from _Carl Schildkraut_, Aug 14 2015 %E A252790 a(8)-a(9) from _Kevin P. Thompson_, May 01 2022