A079671 - OEIS

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A079671

Number of irreducible polynomials (over the rationals) of form a*x^2+b*x+c 1<=a<=n, 1<=b<=n, 1<=c<=n.

0

1, 7, 24, 56, 112, 196, 313, 469, 672, 926, 1239, 1611, 2057, 2577, 3179, 3863, 4647, 5523, 6512, 7606, 8819, 10155, 11624, 13214, 14955, 16841, 18880, 21076, 23448, 25966, 28683

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..31.

PROG

(PARI) a(n)=sum(a=1, n, sum(b=1, n, sum(c=1, n, polisirreducible(a*x^2+b*x+c))))

CROSSREFS

Sequence in context: A168668 A159225 A146298 * A212511 A100454 A081436

Adjacent sequences: A079668 A079669 A079670 * A079672 A079673 A079674

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Jan 25 2003

STATUS

approved