A119964 Numerator of the n-th Artin product.

1, 5, 19, 779, 84911, 2632241, 713337311, 1163866139, 587752400195, 476667196558145, 2856927907113011, 345688276760674331, 13819099649042566549, 4988694973304366524189, 10780569837310736058772429

Offset

1,2

Comments

Artin's constant (A005596) is equal to Product[1-1/(Prime[k]*(Prime[k]-1)),{k,1,Infinity}]. n-th Artin product is Product[1-1/(Prime[k]*(Prime[k]-1)),{k,1,n}].

Links

Table of n, a(n) for n=1..15.

Eric Weisstein's World of Mathematics, Artin's Constant.

Formula

a(n) = Numerator[ Product[ 1 - 1/(Prime[k]*(Prime[k]-1)), {k,1,n}]].

Mathematica

Table[Numerator[Product[1-1/(Prime[k]*(Prime[k]-1)), {k, 1, n}]], {n, 1, 20}]

Crossrefs

Cf. A119534, A091568, A091567, A005596, A048296.

Sequence in context: A092663 A072526 A095218 * A270477 A279256 A174490

Adjacent sequences: A119961 A119962 A119963 * A119965 A119966 A119967

Keyword

frac,nonn

Author

Alexander Adamchuk, Aug 03 2006

Status

approved