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 A102139 #12 Apr 10 2020 15:56:30 %S A102139 4,6,7,11,15,19,233,549,1608,4143,4633,9642 %N A102139 Iccanobirt prime indices (9 of 15): Indices of prime numbers in A102119. %C A102139 No more terms through 5000. %C A102139 a(13) > 50000. - _Robert Price_, Nov 09 2018 %F A102139 A102119(a(n)) = A102159(n). %t A102139 a[n_] := a[n] = %t A102139 IntegerReverse[(a[n - 1] + a[n - 2] + IntegerReverse[a[n - 3]])]; %t A102139 a[0] = 0; a[1] = 0; a[2] = 1; %t A102139 Select[Range[0, 5000], PrimeQ[a[#]] &] (* _Robert Price_, Apr 10 2020 *) %Y A102139 Cf. A000040, A102119, A102131-A102145. %K A102139 nonn,more,base %O A102139 1,1 %A A102139 _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004 %E A102139 a(12) from _Robert Price_, Nov 09 2018