A328792 - OEIS

A328792

Numbers that are not the difference between any triangular number and the largest square that does not exceed it.

4, 7, 8, 13, 16, 18, 22, 23, 25, 26, 31, 33, 34, 37, 38, 40, 43, 47, 48, 49, 52, 58, 59, 60, 61, 63, 64, 67, 68, 70, 73, 76, 79, 81, 83, 85, 86, 88, 92, 93, 94, 97, 98, 99, 102, 103, 106, 108, 112, 113, 114, 115, 118, 121, 123, 124, 125, 130, 133, 134, 138

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..61.

EXAMPLE

For any triangular number t, let f(t) = t - floor(sqrt(t))^2.

0 is not a term: for each term t in A001110, f(t) = 0.

1 is not a term: for each term t > 1 in A164055, f(t) = 1.

2 is not a term: for each term t in A214838, f(t) = 2.

3 is not a term: for each term t > 3 in A328791, f(t) = 3.

4 is a term, however: there exists no triangular number t such that f(t) = 4.