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 A101764 #21 Nov 12 2022 05:28:08
%S A101764 8,10,13,17,23,26,28,29,31,39,42,53,55,56,73,83,94,98,101,113,114,115,
%T A101764 121,167,217,255,266,326,327,333,367,389,397,404,409,423,425,467,497,
%U A101764 570,631,639,749,761
%N A101764 Iccanobif semiprime indices: Indices of semiprime numbers in A014258.
%C A101764 This sequence also includes 815, 862, 943, 1013, 1106, 1204, 1319, 1398, 1419, 1554, 1669, 1729, 1762, 1801, 1847, 1874, 1930, 1977, and 2123. It might or might not include 791, 927, 1022, 1027, 1110, 1129, 1307, 1558, 1662, 1694, 1723, 1747, 1850, 1934, 1954, 1978, 2014, 2069, and 2077, but the required factoring proved rather difficult. There are no further terms below 2123. - _Lucas A. Brown_, Nov 12 2022
%H A101764 Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/A101764.py">A101764.py</a>.
%t A101764 nxt[{a_,b_}]:={b,IntegerReverse[a+b]}; Flatten[Position[NestList[nxt,{0,1},500][[All,1]],_?(PrimeOmega[#]==2&)]]-1 (* _Harvey P. Dale_, Jun 05 2022 *)
%Y A101764 Cf. A001358, A001129, A014258, A014259, A014260, A101763, A101765, A101766.
%K A101764 nonn,base,hard,more
%O A101764 1,1
%A A101764 _Jonathan Vos Post_ and _Ray Chandler_, Dec 15 2004
%E A101764 Missing 367 inserted and new terms 570-761 added by _Lucas A. Brown_, Nov 12 2022