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A333009 Successive differences of A333008 (square roots of perfect squares that are the sum of two nonzero pentagonal numbers). 4
5, 3, 6, 5, 10, 4, 20, 17, 8, 1, 7, 2, 1, 1, 8, 1, 3, 8, 7, 2, 4, 4, 3, 11, 6, 4, 3, 9, 5, 7, 5, 3, 1, 2, 2, 1, 3, 2, 6, 1, 24, 1, 6, 1, 9, 8, 14, 4, 5, 4, 5, 5, 9, 2, 3, 2, 14, 3, 6, 8, 4, 2, 4, 10, 1, 2, 7, 1, 6, 8, 6, 7, 1, 8, 5, 7, 12, 8, 4, 4, 5, 2, 11, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The behavior of this sequence is unexpectedly quite complex.

LINKS

Peter Kagey, Table of n, a(n) for n = 1..1000

CROSSREFS

Cf. A332986 (analog for indices of triangular numbers).

Cf. A000326, A333007, A333008.

Sequence in context: A075264 A221710 A011504 * A237656 A097907 A198749

Adjacent sequences:  A333006 A333007 A333008 * A333010 A333011 A333012

KEYWORD

nonn

AUTHOR

Olivier Gérard, Mar 05 2020

STATUS

approved

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Last modified July 14 10:01 EDT 2020. Contains 335721 sequences. (Running on oeis4.)