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A220103 Triangular numbers that are also Jacobsthal numbers (A001045). 0
0, 1, 3, 21, 171 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..5.

Thomas Koshy and Zhenguang Gao, Triangular Numbers in the Jacobsthal Family, INTEGERS, Electronic J. of Combinatorial Number Theory, Vol. 12, Paper A64, 2012.

CROSSREFS

Cf. A000217, A001045.

Sequence in context: A262977 A214391 A046637 * A132805 A189475 A331328

Adjacent sequences:  A220100 A220101 A220102 * A220104 A220105 A220106

KEYWORD

nonn,fini,full

AUTHOR

Eric M. Schmidt, Dec 04 2012

STATUS

approved

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Last modified February 20 04:49 EST 2020. Contains 332063 sequences. (Running on oeis4.)