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 A348788 #26 Nov 20 2021 18:30:48 %S A348788 1,12,15,18,24,30,27,32,36,40,42,44,48,56,50,54,60,63,66,64,70,65,68, %T A348788 72,69,75,78,76,84,80,87,77,81,88,91,90,98,93,92,96,100,105,102,99, %U A348788 104,108,110,114,120,132,112,115,124,130,119,123,126,125,128,135,138,129,136,140,144,150,141,147,152,156,148,153,160,154,162,155 %N A348788 Values of A347113(k) for k in A348787. %C A348788 By definition, the points (A348787(k), a(k)) form the main diagonal of A347113. %C A348788 It appears that apart from a very small number of exceptions this sequence consists of the numbers that are neither primes nor twice primes (A264828). %C A348788 The known exceptions (based on the first 20000 terms) are: (a) the three primes A347113(1423) = 1327, A347113(10686) = 9967, and A347113(83051) = 77647 that are unusually close to the line y=x, and (b) the 27 terms [8, 9, 16, 20, 21, 25, 28, 33, 35, 39, 45, 49, 51, 52, 55, 57, 85, 95, 111, 116, 117, 121, 133, 143, 145, 169, 187] which are in A264828 but are not in the present sequence. %C A348788 This list of 27 exceptions is surprisingly similar to A181780, but this may be just a coincidence. %H A348788 N. J. A. Sloane, <a href="/A348788/b348788.txt">Table of n, a(n) for n = 1..20000</a> %Y A348788 Cf. A264828, A347113, A348787, A181780. %K A348788 nonn %O A348788 1,2 %A A348788 _N. J. A. Sloane_, Nov 20 2021