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 A348244 #9 Oct 30 2021 01:25:16 %S A348244 1,2,4,6,48,50,52,54,56,58,1375,1377,1379,1381,1383,1385,1387,1389, %T A348244 1391,1393,1395,1397,3739,3741,3743,3745,3747,3749,3751,3753,3755, %U A348244 3757,3759,3761,3763,3765,3767,3769,3771,3773,6681,6683,6685,6687,6689,6691,6693,6695,6697,6699,6701,6703,6705 %N A348244 Indices of 1's in A307720. %C A348244 Theorem: This sequence is infinite. Proof: Every prime in A307720 is immediately preceded or followed by a 1. - _N. J. A. Sloane_, Oct 30 2021 %C A348244 The start of this sequence consists of arithmetic progressions of constant difference 2 and lengths 1, 3, 6, 12, 18, 26, 76, ... that start with 1, 2, 48, 1375, 3739, 6681, 84627, 91833, ... It would be nice to have an alternative way to explain these numbers. %H A348244 N. J. A. Sloane, <a href="/A348244/b348244.txt">Table of n, a(n) for n = 1..927</a> %Y A348244 Cf. A307720. %K A348244 nonn %O A348244 1,2 %A A348244 _N. J. A. Sloane_, Oct 16 2021