A334013 - OEIS

A334013

a(n) is the least integer that is the sum of two nonzero tetrahedral numbers in exactly n ways.

2, 140, 102424, 43322844421220 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,1`
	LINKS	`Table of n, a(n) for n=1..4.` `Eric Weisstein's World of Mathematics, Tetrahedral Number` `Index to sequences related to pyramidal numbers`
	EXAMPLE	`Let Te(k) denote the k-th tetrahedral number, then` `a(1) = Te(1) + Te(1);` `a(2) = Te(7) + Te(6) = Te(8) + Te(4);` `a(3) = Te(82) + Te(34) = Te(83) + Te(27) = Te(84) + Te(7);` `a(4) = Te(60500) + Te(33760) = Te(53311) + Te(47682) = Te(63383) + Te(17423) = Te(63495) + Te(15790);`
	CROSSREFS	`Cf. A000292, A010329, A011541, A053587.` `Sequence in context: A220513 A120814 A221601 * A115890 A356747 A215187` `Adjacent sequences: A334010 A334011 A334012 * A334014 A334015 A334016`
	KEYWORD	`nonn,hard,more`
	AUTHOR	`Ilya Gutkovskiy, Apr 12 2020`
	EXTENSIONS	`a(4) from Giovanni Resta, Apr 13 2020`
	STATUS	`approved`

Last modified March 28 17:47 EDT 2023. Contains 361596 sequences. (Running on oeis4.)