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A067565 Inverse of Ron Graham's sequence (A006255), or zero iff n is a prime. 0
1, 0, 0, 4, 0, 2, 0, 3, 9, 5, 0, 6, 0, 7, 8, 16, 0, 10, 0, 12, 14, 11, 0, 15, 25, 13, 18, 21, 0, 20, 0, 24, 22, 17, 27, 36, 0, 19, 26, 28, 0, 30, 0, 33, 32, 23, 0, 35, 49, 40, 34, 39, 0, 48, 44, 42, 38, 29, 0, 45, 0, 31, 50, 64, 52, 55, 0, 51, 46, 54 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

COMMENTS

a(n) = n iff n is a perfect square.

CROSSREFS

Sequence in context: A054375 A195739 A136452 * A010635 A019200 A087604

Adjacent sequences:  A067562 A067563 A067564 * A067566 A067567 A067568

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 30 2002

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Last modified February 16 16:41 EST 2012. Contains 205938 sequences.