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A332986 Successive differences of index of triangular numbers sum of two pentagonal numbers. 2
1, 4, 6, 18, 2, 7, 1, 4, 1, 2, 4, 5, 5, 3, 1, 2, 2, 5, 3, 3, 4, 3, 1, 10, 1, 1, 8, 3, 4, 7, 5, 12, 10, 8, 9, 7, 3, 5, 3, 6, 3, 10, 11, 1, 2, 13, 9, 6, 3, 2, 1, 2, 3, 3, 2, 2, 6, 13, 9, 4, 1, 11, 1, 3, 8, 9, 1, 4, 6, 3, 8, 3, 5, 2, 3, 2, 5, 1, 14, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The behavior of this sequence is unexpectedly quite complex.
LINKS
CROSSREFS
Cf. A000217 (triangular numbers), A000326 (pentagonal numbers), A332987 (sums of two nonzero pentagonal numbers), A333009 (analog for indices of square numbers).
Cf. First differences of A332985.
Sequence in context: A211949 A079803 A061361 * A113610 A309334 A263319
KEYWORD
nonn
AUTHOR
Olivier Gérard, Mar 05 2020
STATUS
approved

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Last modified March 3 11:10 EST 2024. Contains 370511 sequences. (Running on oeis4.)