A104024 Least number k which can be written as k^2 * j, 0 < j <= k in n ways.

2, 1, 64, 900, 5184, 32400, 57600, 176400, 705600, 1166400, 3240000, 6350400, 14288400, 37454400, 25401600, 87609600

Offset

0,1

Links

Table of n, a(n) for n=0..15.

Mathematica

t = Sort[ Flatten[ Table[n = k^2*j; If[n < 10^7, n, {}], {k, 10000}, {j, k}]]]; l = Length[t]; t[[Select[ Range[l - 11], t[[ # ]] == t[[ # + 11]] &]]]

Crossrefs

Cf. A102354, A104020, A104022.

Sequence in context: A363381 A221194 A309207 * A339144 A233472 A284596

Adjacent sequences: A104021 A104022 A104023 * A104025 A104026 A104027

Keyword

nonn

Author

Leroy Quet and Robert G. Wilson v, Feb 23 2005

Status

approved