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A104024 Least number k which can be written as k^2 * j, 0 < j <= k in n ways. 3
2, 1, 64, 900, 5184, 32400, 57600, 176400, 705600, 1166400, 3240000, 6350400, 14288400, 37454400, 25401600, 87609600 (list; graph; refs; listen; history; text; internal format)
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: A092650 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

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Last modified July 25 10:07 EDT 2021. Contains 346289 sequences. (Running on oeis4.)