280908

Appears in sequences

• Numbers k such that 7*4^k + 1 is prime.at n=31A002255
• Low-temperature specific heat expansion for honeycomb net (Potts model, q=4).at n=6A057396
• Number of perfect matchings in the C_{2n} X P_3 graph (C_{2n} is the cycle graph on 2n vertices and P_3 is the path graph on 3 vertices).at n=8A102091
• Numbers with prime factorization p^2*q^2*r^5 where p, q, and r are distinct primes.at n=20A190114
• Numbers such that the list of exponents of their factorization is a palindromic list of primes.at n=37A322525
• Numbers w + x + y + z where (w,x,y,z) are nonnegative solutions to the Diophantine equation w^2 + x^2 + y^2 + z^2 = w*x*y*z.at n=18A385713