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A217735
a(n) = the least positive integer m such that n^3 + m^3 is a square, or 0, if (presumably) there is no such m.
1
2, 1, 0, 8, 0, 0, 21, 4, 18, 65, 37, 0, 0, 70, 0, 32, 0, 9, 0, 0, 7, 26, 1177, 0, 50, 22, 0, 84, 0, 0, 0, 16, 88, 450, 665, 72, 11, 1178, 0, 260, 0, 0, 0, 148, 0, 2, 0, 0, 98, 25, 0, 0, 0, 0, 0, 65, 112, 0, 0, 0, 0, 0, 189, 128, 10, 0, 0, 0, 0, 14, 0, 36, 0, 0, 0, 0, 0, 273, 0, 0, 162, 0, 0, 28, 0, 602, 0, 33, 0, 585, 65, 4708, 0, 0, 1121
OFFSET
1,1
COMMENTS
All zero terms are suggestive(?). All positive terms are certain.
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..1000 (see comments in b-file)
EXAMPLE
n=1: 1^3+2^3=3^2
n=2: 2^3+1^3=3^2
n=4: 4^3+8^3=24^2
n=7: 7^3+21^3=98^2
CROSSREFS
Cf. A103254 (values of n such that a(n) > 0).
Sequence in context: A325872 A021896 A188835 * A369585 A075615 A195284
KEYWORD
nonn
AUTHOR
Zak Seidov, Mar 22 2013
STATUS
approved