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

Author

Ilya Gutkovskiy, Apr 12 2020

Keywords

• nonn

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

• 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.

Extensions

More terms from Jinyuan Wang, Apr 13 2020