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A374141
a(n) is the smallest number which can be represented as the sum of two distinct nonzero hexagonal numbers in exactly n ways, or -1 if no such number exists.
5
7, 384, 4995, 51106, 204805, 483031, 2443431, 4674256, 10476781, 17272531, 25600656, 60765331, 90406956, 206602126, 332808531, 481676406, 303826656, 435211156, 789949306, 1406495106, 2260173906, 2704798281, 3220562556, 4435869181, 5165053156, 5309576106, 9818788281
OFFSET
1,1
LINKS
Michael S. Branicky, Table of n, a(n) for n = 1..39
Eric Weisstein's World of Mathematics, Hexagonal Number
EXAMPLE
a(2) = 384 = 6 + 378 = 153 + 231.
PROG
(Python) # see linked program
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Gutkovskiy, Jun 28 2024
EXTENSIONS
a(9)-a(27) from Michael S. Branicky, Jun 29 2024
STATUS
approved