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 A115893 #9 Jul 15 2021 21:23:32
%S A115893 1,2,5,4813,47619
%N A115893 Numbers k such that sigma(k)*prime(k) is a palindrome.
%C A115893 No additional terms up to 5*10^6. - _Harvey P. Dale_, Sep 14 2012
%e A115893 sigma(47619)*prime(47619) = 82992*580477 = 48174947184.
%t A115893 dspQ[n_]:=Module[{c=IntegerDigits[DivisorSigma[1,n]Prime[n]]},c == Reverse[c]]; Select[Range[50000],dspQ] (* _Harvey P. Dale_, Sep 14 2012 *)
%Y A115893 Cf. A084122, A115890, A115894.
%K A115893 nonn,base
%O A115893 1,2
%A A115893 _Giovanni Resta_, Feb 06 2006