A334036 a(n) is the least integer that can be expressed as the difference of two heptagonal numbers in exactly n ways.

1, 81, 468, 1911, 6237, 11781, 21021, 51051, 81081, 121737, 261261, 318087, 513513, 671517, 1145529, 1072071, 1582581, 1378377, 3216213, 2513511, 4135131, 4700619, 5666661, 11792781, 8729721, 11810799, 15444891, 19270251, 15162147, 24657633, 28945917, 26189163

Offset

1,2

Comments

The least integer that can be expressed as the sum of one or more consecutive numbers congruent to 1 mod 5 in exactly n ways.

Index of first occurrence of n in A333817.

Links

Table of n, a(n) for n=1..32.

Eric Weisstein's World of Mathematics, Heptagonal Number

Index to sequences related to polygonal numbers

Crossrefs

Cf. A000566, A016861, A038547, A068314, A333817, A334011, A334034, A334035, A334037.

Sequence in context: A183963 A236354 A236349 * A253524 A254422 A253517

Adjacent sequences: A334033 A334034 A334035 * A334037 A334038 A334039

Keyword

nonn

Author

Ilya Gutkovskiy, Apr 12 2020

Extensions

More terms from Jinyuan Wang, Apr 13 2020

Status

approved