90469

Properties

Appears in sequences

• Number of parallelogram polyominoes of site-perimeter n (also called staircase polyominoes, although that term is overused).at n=19A075125
• Canyon primes (A134971) whose first and last digits are 9.at n=31A179673
• G.f.: A(x) = exp( Sum_{n>=1} G_n(x^n)^2 * x^n/n ) such that G_n(x^n) = Product_{k=0..n-1} A(u^k*x) where u is an n-th root of unity.at n=9A203266
• Septic artiads: primes p congruent to 1 mod 14 for which all solutions of the congruence x^3 + x^2 - 2x - 1 == 0 (mod p) are 7th power residues.at n=25A270800
• Prime numbersat n=8758