A130419 Triangle (of n terms per row) where t(n,m) = the m-th positive integer which is coprime to n!!. (n!! = n*(n-2)*(n-4)..*(2 or 1).).

1, 1, 3, 1, 2, 4, 1, 3, 5, 7, 1, 2, 4, 7, 8, 1, 5, 7, 11, 13, 17, 1, 2, 4, 8, 11, 13, 16, 1, 5, 7, 11, 13, 17, 19, 23, 1, 2, 4, 8, 11, 13, 16, 17, 19, 1, 7, 11, 13, 17, 19, 23, 29, 31, 37, 1, 2, 4, 8, 13, 16, 17, 19, 23, 26, 29, 1, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 1, 2, 4, 8, 16, 17

Offset

1,3

Links

Table of n, a(n) for n=1..84.

Maple

A130419 := proc(n, m) local ndf, mprime, a ; ndf := doublefactorial(n) ; a := 0 ; for mprime from 1 to m do a := a+1 ; while gcd(a, ndf) <> 1 do a := a+1 ; od ; od ; RETURN(a) ; end: for n from 1 to 15 do for m from 1 to n do printf("%d, ", A130419(n, m)) ; od ; od ; # R. J. Mathar, Jun 06 2007

Crossrefs

Cf. A130420, A130418.

Sequence in context: A016468 A134839 A077581 * A083110 A059016 A080418

Adjacent sequences: A130416 A130417 A130418 * A130420 A130421 A130422

Keyword

nonn,tabl

Author

Leroy Quet, May 25 2007

Extensions

More terms from R. J. Mathar, Jun 06 2007

Status

approved