30938

Appears in sequences

• Sum of first n 7-almost primes.at n=30A086059
• Iccanobirt prime indices (4 of 15): Indices of prime numbers in A102114.at n=18A102134
• G.f. satisfies: A(x) = C(x)^2 * A(x^3*C(x)^4), where C(x) is the g.f. of the Catalan numbers (A000108).at n=9A120899
• Numbers k such that there is a number m < k satisfying A000203(k) = A000203(m) = m + k - gcd(m,k).at n=37A124141
• Number of nondecreasing integer sequences of length 25 with sum zero and sum of absolute values 2n.at n=14A158159
• Eight bishops and one elephant on a 3 X 3 chessboard. a(n) = 2^(n+2) - 3*F(n+2).at n=13A175660
• Index in A353715 of the first term divisible by 2^n and no higher power of 2, or -1 if no such term exists.at n=9A353727