A374808 - OEIS

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A374808

a(n) is the smallest number which can be represented as the sum of 3 distinct nonzero tetrahedral numbers in exactly n ways, or -1 if no such number exists.

1

15, 95, 305, 1795, 2366, 12740, 105080, 193060, 231560, 446995, 2422980, 4753420, 5490660, 8205340, 30594200, 137606920, 138532800, 350464520

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OFFSET

1,1

LINKS

Table of n, a(n) for n=1..18.

Eric Weisstein's World of Mathematics, Tetrahedral Number

EXAMPLE

a(3) = 305 = 1 + 84 + 220 = 20 + 120 + 165 = 56 + 84 + 165.

CROSSREFS

Cf. A000292, A334013, A374806, A374809.

Sequence in context: A114240 A189657 A190274 * A052459 A336278 A044266

Adjacent sequences: A374805 A374806 A374807 * A374809 A374810 A374811

KEYWORD

nonn,more,changed

AUTHOR

Ilya Gutkovskiy, Jul 20 2024

EXTENSIONS

a(12)-a(18) from Michael S. Branicky, Jul 21 2024

STATUS

approved