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A072400 (Factors of 4 removed from n) modulo 8. 2
1, 2, 3, 1, 5, 6, 7, 2, 1, 2, 3, 3, 5, 6, 7, 1, 1, 2, 3, 5, 5, 6, 7, 6, 1, 2, 3, 7, 5, 6, 7, 2, 1, 2, 3, 1, 5, 6, 7, 2, 1, 2, 3, 3, 5, 6, 7, 3, 1, 2, 3, 5, 5, 6, 7, 6, 1, 2, 3, 7, 5, 6, 7, 1, 1, 2, 3, 1, 5, 6, 7, 2, 1, 2, 3, 3, 5, 6, 7, 5, 1, 2, 3, 5, 5, 6, 7, 6, 1, 2, 3, 7, 5, 6, 7, 6 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

a(n)<>7 iff n equals the sum of 3 integer squares.

a(A004215(k)) = 7 for k>0;

LINKS

Eric Weisstein's World of Mathematics, Square Numbers.

CROSSREFS

a(n) = A065883(n) mod 8.

A072401(n) = 1 - A057427(7 - a(n)).

Cf. A000378.

Sequence in context: A182938 A055231 A160400 * A007913 A083346 A065883

Adjacent sequences:  A072397 A072398 A072399 * A072401 A072402 A072403

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jun 16 2002

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.