A132083 a(n) = n-th positive integer which is coprime to (2^n +1). Also, a(n) = final term of row n in triangle A132082.

1, 2, 4, 4, 7, 7, 10, 8, 13, 12, 16, 12, 19, 17, 25, 16, 25, 23, 28, 21, 31, 27, 34, 24, 40, 32, 43, 29, 43, 42, 46, 32, 49, 42, 59, 38, 55, 47, 58, 40, 61, 59, 64, 46, 79, 57, 70, 48, 74, 63, 76, 55, 79, 73, 91, 56, 85, 72, 88, 63, 91, 77, 103, 64, 106, 88, 100, 72, 103, 93, 106

Offset

1,2

Links

Table of n, a(n) for n=1..71.

Mathematica

a = {1}; Do[i = 1; c = 0; While[c < n, If[GCD[i, 2^n + 1] == 1, c++ ]; i++ ]; AppendTo[a, i - 1], {n, 2, 80}]; a (* Stefan Steinerberger, Dec 26 2007 *)

Crossrefs

Cf. A132082, A131880.

Sequence in context: A023831 A233272 A023844 * A286014 A102465 A139825

Adjacent sequences: A132080 A132081 A132082 * A132084 A132085 A132086

Keyword

nonn

Author

Leroy Quet, Aug 09 2007

Extensions

More terms from Stefan Steinerberger, Dec 26 2007

Status

approved