A057052 Let R(i,j) be the rectangle with antidiagonals 1; 2,3; 4,5,6; ...; each k is an R(i(k),j(k)) and A057052(n) = i(n^3).

1, 2, 6, 9, 5, 6, 18, 16, 26, 10, 5, 17, 52, 43, 54, 1, 62, 54, 73, 125, 81, 63, 77, 129, 49, 185, 180, 7, 79, 204, 145, 128, 159, 244, 97, 296, 250, 257, 323, 97, 286, 168, 106, 106, 174, 316, 83, 377, 279, 250, 296, 423, 92, 384, 199

Offset: 1

Author

Clark Kimberling, Jul 30 2000

Keywords

• nonn

Links

• Ivan Neretin, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A002260 = i(n), A057049 = i(n^2).

Programs

Mathematica

# - (l = Floor[Sqrt[2 #] - 1/2]) (l + 1)/2 & /@ ((Range@55)^3) (* Ivan Neretin, May 28 2015 *)