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A093486 Least k >= 0 such that k! + n is a square, or -1 if no such number exists. 0
0, 4, 2, 0, -1, -1, -1, 2, 0, 6, 3, -1, 4, -1, 2, 0, -1, -1, -1, 3, -1, -1, -1, 2, 0, 4, -1, -1, -1, -1, 3, -1, -1, -1, 2, 0, -1, -1, -1, -1, 4, -1, -1, 3, -1, -1, -1, 2, 0, 5, -1, -1, -1, -1, -1, -1, -1, 4, 3, -1, -1, -1, 2, 0, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 3, 4, -1, -1, 2, 0, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 3, -1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

It is only a guess that a(4)=a(5)=a(6) = -1.

All -1 values are unproved. I have checked all k <= 2000. - David Wasserman, Apr 06 2007

LINKS

Table of n, a(n) for n=1..96.

CROSSREFS

Sequence in context: A107088 A137986 A330768 * A259618 A115143 A093556

Adjacent sequences:  A093483 A093484 A093485 * A093487 A093488 A093489

KEYWORD

less,sign

AUTHOR

Amarnath Murthy, Apr 14 2004

EXTENSIONS

More terms from David Wasserman, Apr 06 2007

STATUS

approved

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Last modified October 21 06:32 EDT 2021. Contains 348141 sequences. (Running on oeis4.)