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 A328792 #9 Oct 31 2019 01:25:14 %S A328792 4,7,8,13,16,18,22,23,25,26,31,33,34,37,38,40,43,47,48,49,52,58,59,60, %T A328792 61,63,64,67,68,70,73,76,79,81,83,85,86,88,92,93,94,97,98,99,102,103, %U A328792 106,108,112,113,114,115,118,121,123,124,125,130,133,134,138 %N A328792 Numbers that are not the difference between any triangular number and the largest square that does not exceed it. %e A328792 For any triangular number t, let f(t) = t - floor(sqrt(t))^2. %e A328792 0 is not a term: for each term t in A001110, f(t) = 0. %e A328792 1 is not a term: for each term t > 1 in A164055, f(t) = 1. %e A328792 2 is not a term: for each term t in A214838, f(t) = 2. %e A328792 3 is not a term: for each term t > 3 in A328791, f(t) = 3. %e A328792 4 is a term, however: there exists no triangular number t such that f(t) = 4. %Y A328792 The complement of A230044. %Y A328792 Cf. A001110, A064784, A164055, A214838, A328791. %K A328792 nonn %O A328792 1,1 %A A328792 _Jon E. Schoenfield_, Oct 27 2019