OFFSET
1,1
COMMENTS
There are no further positive terms <= 10^15. - Michael S. Branicky, Jul 01 2024
LINKS
Eric Weisstein's World of Mathematics, Pentagonal Pyramidal Number
EXAMPLE
a(2) = 1471 = 1 + 1470 = 288 + 1183.
CROSSREFS
KEYWORD
nonn,hard,more,bref
AUTHOR
Ilya Gutkovskiy, Jun 30 2024
STATUS
approved