A019328 Cyclotomic polynomials at x=10.

9, 11, 111, 101, 11111, 91, 1111111, 10001, 1001001, 9091, 11111111111, 9901, 1111111111111, 909091, 90090991, 100000001, 11111111111111111, 999001, 1111111111111111111, 99009901, 900900990991, 9090909091, 11111111111111111111111, 99990001

Offset: 1

Author

Simon Plouffe

Keywords

• nonn

Comments

See A138940 for indices n for which a(n) is prime. - M. F. Hasler, Jan 09 2015

Links

• Paolo Xausa, Table of n, a(n) for n = 1..900
• Index entries for cyclotomic polynomials, values at X

Programs

Maple

with(numtheory,cyclotomic); f := n->subs(x=10,cyclotomic(n,x)); seq(f(i),i=0..64);

Mathematica

Cyclotomic[Range[30], 10] (* Paolo Xausa, Feb 26 2024 *)

PARI

A019328(n)=polcyclo(n,10) \\ Simplified by M. F. Hasler, Jan 09 2015