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A220103
Triangular numbers that are also Jacobsthal numbers (A001045).
0
0, 1, 3, 21, 171
OFFSET
1,3
LINKS
Thomas Koshy and Zhenguang Gao, Triangular Numbers in the Jacobsthal Family, INTEGERS, Electronic J. of Combinatorial Number Theory, Vol. 12, Paper A64, 2012.
CROSSREFS
Sequence in context: A214391 A370284 A046637 * A132805 A372459 A189475
KEYWORD
nonn,fini,full
AUTHOR
Eric M. Schmidt, Dec 04 2012
STATUS
approved