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 A379804 #7 Feb 09 2025 19:07:41
%S A379804 14,15,18,45,51,52,54,58,59,60,61,62,65,71,101,102,104,106,111,114,
%T A379804 117,120,121,122,123,124,125,126,128,130,141,161,164,176,189,203,204,
%U A379804 213,215,229,241,256,261,262,281,284,301,306,307,310,311,312,314,315,316
%N A379804 By definition, |A379803(k)| is twice a perfect square, say 2*b(k)^2. The values of b(k) appear to be the consecutive natural numbers 1, 2, 3, ... except that the numbers in the present sequence are omitted.
%C A379804 The sequence {b(k): k >= 1} begins 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 17, 19, 20, ..., and as can be seen, 14, 15, and 18 are missing.
%C A379804 The values of b(k) are distinct.
%H A379804 Rémy Sigrist, <a href="/A379804/b379804.txt">Table of n, a(n) for n = 1..5000</a>
%H A379804 Rémy Sigrist, <a href="/A379804/a379804.txt">C++ program</a>
%o A379804 (C++) // See Links section.
%Y A379804 Cf. A377091, A379066, A379788-A379794, A379802, A379803.
%K A379804 nonn
%O A379804 1,1
%A A379804 _N. J. A. Sloane_, Jan 19 2025
%E A379804 More terms from _Rémy Sigrist_, Feb 09 2025