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A334036 a(n) is the least integer that can be expressed as the difference of two heptagonal numbers in exactly n ways. 4
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 (list; graph; refs; listen; history; text; internal format)
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
Eric Weisstein's World of Mathematics, Heptagonal Number
CROSSREFS
Sequence in context: A183963 A236354 A236349 * A253524 A254422 A253517
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Apr 12 2020
EXTENSIONS
More terms from Jinyuan Wang, Apr 13 2020
STATUS
approved

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Last modified February 21 20:02 EST 2024. Contains 370237 sequences. (Running on oeis4.)