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

1,1

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

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 *)

Prog

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

Crossrefs

Sequence in context: A359457 A365221 A027727 * A119786 A147429 A147461

Adjacent sequences: A019325 A019326 A019327 * A019329 A019330 A019331

Keyword

nonn

Author

Simon Plouffe

Status

approved