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A107393 a(n)=-1 iff n is a prime, a(n)= 1 iff n is equal to the sum of three primes, a(n)= 2 iff n is equal to the sum of two primes, else a(n)= 0. 0
0, 0, -1, -1, 2, -1, 2, -1, 2, 0, 2, -1, 2, -1, 2, 1, 2, -1, 2, -1, 2, 1, 2, -1, 2, 1, 2, 1, 2, -1, 2, -1, 2, 1, 2, 1, 2, -1, 2, 1, 2, -1, 2, -1, 2, 1, 2, -1, 2, 1, 2, 1, 2, -1, 2, 1, 2, 1, 2, -1, 2, -1, 2, 1, 2, 1, 2, -1, 2, 1, 2, -1, 2, -1, 2, 1, 2, 1, 2, -1, 2, 1, 2, -1, 2, 1, 2, 1, 2, -1, 2, 1, 2, 1, 2, 1, 2, -1, 2, 1, 2, -1, 2, -1 (list; graph; refs; listen; history; internal format)
OFFSET

0,5

CROSSREFS

Sequence in context: A060024 A143668 A029445 * A197366 A047885 A072731

Adjacent sequences:  A107390 A107391 A107392 * A107394 A107395 A107396

KEYWORD

sign

AUTHOR

Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), May 25 2005

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Last modified February 16 18:43 EST 2012. Contains 205939 sequences.