A333009 Successive differences of A333008 (square roots of perfect squares that are the sum of two nonzero pentagonal numbers).

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

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: A221710 A011504 A357467 * A363229 A237656 A371847

Adjacent sequences: A333006 A333007 A333008 * A333010 A333011 A333012

Keyword

nonn

Author

Olivier Gérard, Mar 05 2020

Status

approved