A334037 a(n) is the least integer that can be expressed as the difference of two octagonal numbers in exactly n ways.

1, 133, 560, 1729, 4160, 10640, 14560, 22400, 44800, 58240, 138320, 98560, 123200, 203840, 246400, 394240, 320320, 492800, 800800, 640640, 1047200, 1823360, 1724800, 1281280, 2094400, 1601600, 2475200, 2722720, 4484480, 3203200, 5532800, 6697600, 5445440, 7958720

Offset

1,2

Comments

The least integer that can be expressed as the sum of one or more consecutive numbers congruent to 1 mod 6 in exactly n ways.

Index of first occurrence of n in A333818.

Links

Table of n, a(n) for n=1..34.

Eric Weisstein's World of Mathematics, Octagonal Number

Index to sequences related to polygonal numbers

Crossrefs

Cf. A000567, A016921, A038547, A068314, A333818, A334012, A334034, A334035, A334036.

Sequence in context: A055940 A251131 A267288 * A137879 A249108 A020237

Adjacent sequences: A334034 A334035 A334036 * A334038 A334039 A334040

Keyword

nonn

Author

Ilya Gutkovskiy, Apr 12 2020

Extensions

More terms from Jinyuan Wang, Apr 13 2020

Status

approved