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 A252795 #22 May 02 2022 10:27:08 %S A252795 3,7,37,43,49,51,57,73,127 %N A252795 Numbers m such that 10^m + m is a semiprime. %C A252795 a(10) >= 217. - _Hugo Pfoertner_, Aug 06 2019 %C A252795 574 and 601 are also terms in this sequence. - _Kevin P. Thompson_, May 02 2022 %H A252795 factordb.com, <a href="http://factordb.com/index.php?query=10%5E217%2B217">Status of 10^217+217</a>. %e A252795 3 is in this sequence because 10^3+3 = 17*59 is semiprime. %e A252795 7 is in this sequence because 10^7+7 = 941*10627 and these two factors are prime. %t A252795 Select[Range[70], PrimeOmega[10^# + #]==2 &] %o A252795 (Magma) IsSemiprime:=func<i | &+[d[2]: d in Factorization(i)] eq 2>; [m: m in [1..70] | IsSemiprime(s) where s is 10^m+m]; %o A252795 (PARI) is(n)=bigomega(10^n + n)==2 \\ _Anders Hellström_, Aug 15 2015 %Y A252795 Cf. similar sequences listed in A252788. %Y A252795 Cf. A089379, A252663. %K A252795 nonn,more,hard %O A252795 1,1 %A A252795 _Vincenzo Librandi_, Dec 27 2014 %E A252795 a(8) from _Carl Schildkraut_, Aug 15 2015 %E A252795 Missing a(8) term added by _Kevin P. Thompson_, May 02 2022