OFFSET
1,2
COMMENTS
Initial terms are consistent with A069930(n+1). - Andrew Howroyd, Jul 10 2018
a(n) = A069930(n+1) at least for the first 1515 terms. - Antti Karttunen, Sep 25 2018
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..1515
Gerzson Kéri, The factorization of compressed Chebyshev polynomials and other polynomials related to multiple-angle formulas, Annales Univ. Sci. Budapest (Hungary, 2022) Sect. Comp., Vol. 53, 93-108.
PROG
(PARI) a(n)={vecsum(factor(polchebyshev(n, 2, x))[, 2])} \\ Andrew Howroyd, Jul 10 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Yuval Dekel (dekelyuval(AT)hotmail.com), Aug 30 2003
EXTENSIONS
a(11) corrected and a(19)-a(85) from Andrew Howroyd, Jul 10 2018
Terms a(86)-a(105) from Antti Karttunen, Sep 25 2018
STATUS
approved