A368076 - OEIS

%I #10 Dec 27 2023 09:03:34

%S 3,36,2180,10053736

%N a(n) is the least integer that can be expressed as the difference of two positive tetrahedral numbers in exactly n ways.

%C Index of first occurrence of n in A368072.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/TetrahedralNumber.html">Tetrahedral Number</a>

%e a(2) = 36: 36 = 56 - 20 = 120 - 84.

%Y Cf. A000292, A136108, A334007, A368072.

%K nonn,hard,more

%O 1,1

%A _Ilya Gutkovskiy_, Dec 10 2023