202627

Properties

Appears in sequences

• Sums of squared coefficients in the negative powers of the Catalan function: a(n) = Sum_{k=1..n+1} [x^(n-k+1)] 1/C(x^2)^k, where C(x) is the g.f. of A000108.at n=16A132459
• Primes p with P(p+1) also prime, where P(.) is the partition function (A000041).at n=30A234900
• Prime numbersat n=18194