32198

Appears in sequences

• Numbers k such that k^2 + k - 1 and k^2 + k + 1 are twin primes and (k + 1)*(k + 1) + k + 1 - 1 and (k + 1)*(k + 1) + k + 1 + 1 are also twin primes.at n=10A088498
• a(n) = n*(5*n^2 - 3*n + 4) / 6.at n=34A203552
• Expansion of phi(-x^5) * f(x^2, x^8) / psi(-x)^2 in powers of x where phi, psi, f(,) are Ramanujan theta functions.at n=28A259392
• Numbers m such that psi(x) = phi(m) has a solution while sigma(y) = phi(m) has none.at n=34A291524
• Number of simple labeled graphs on n nodes with at most one nontrivial acyclic component.at n=6A332779