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 A252792 #16 Sep 08 2022 08:46:10 %S A252792 2,3,6,12,15,16,30,54,244,850,1488 %N A252792 Numbers m such that 7^m + m is a semiprime. %e A252792 2 is in this sequence because 7^2+2 = 3*17 is semiprime. %e A252792 6 is in this sequence because 7^6+6 = 5*23531 and these two factors are prime. %t A252792 Select[Range[600], PrimeOmega[7^# + #]==2 &] %o A252792 (Magma) IsSemiprime:=func<i | &+[d[2]: d in Factorization(i)] eq 2>; [m: m in [1..600] | IsSemiprime(s) where s is 7^m+m]; %Y A252792 Cf. similar sequences listed in A252788. %Y A252792 Cf. A252660. %K A252792 nonn %O A252792 1,1 %A A252792 _Vincenzo Librandi_, Dec 25 2014 %E A252792 a(9) from _Carl Schildkraut_, Aug 14 2015 %E A252792 a(10) from _Kevin P. Thompson_, Apr 25 2022 %E A252792 a(11) from _Charles R Greathouse IV_, Apr 25 2022