38316961domain: NAppears in sequencesCyclotomic polynomials at x=9.at n=15A019327a(n) = n^8 - n^7 + n^5 - n^4 + n^3 - n + 1.at n=9A060889Super pseudoprimes to base 3 (A328662) with more than two prime factors (counted with multiplicity).at n=15A328663