A334077 a(n) is the smallest positive integer that can be expressed as the difference of two positive triangular numbers in at least n ways.

2, 5, 9, 27, 45, 63, 105, 135, 225, 315, 315, 315, 945, 945, 945, 945, 1575, 1575, 2835, 2835, 3465, 3465, 3465, 3465, 10395, 10395, 10395, 10395, 10395, 10395, 10395, 10395, 17325, 17325, 17325, 17325, 31185, 31185, 31185, 31185, 45045, 45045, 45045, 45045

Offset

1,1

Links

Table of n, a(n) for n=1..44.

Eric Weisstein's World of Mathematics, Triangular Number

Crossrefs

Cf. A000217, A038547, A052346, A053587, A136107, A136108, A214771, A334078.

Sequence in context: A305189 A344394 A243559 * A136108 A026297 A109742

Adjacent sequences: A334074 A334075 A334076 * A334078 A334079 A334080

Keyword

nonn

Author

Ilya Gutkovskiy, Apr 13 2020

Status

approved