30480

Appears in sequences

• Convolution of natural numbers with (1, p(1), p(2), ... ), where p(k) is the k-th prime.at n=37A023538
• Penrice Christmas gift numbers, Card-matching numbers (Dinner-Diner matching numbers): Triangle T(n,k) = number of ways to get k matches for a deck with n cards, 2 of each kind.at n=26A059056
• Card-matching numbers (Dinner-Diner matching numbers).at n=8A059070
• Number of real polynomial invariants for the action of 4 copies of U(2) on the fourth tensor power of C^2.at n=9A129550
• Triangle read by rows: A007318 * A136717.at n=34A137594
• Number of 11 X 11 arrays of squares of integers, symmetric about the diagonal and under 90-degree rotation, with all rows summing to n.at n=51A156407
• Numbers m such that the sum of the first k odd primes = m-th odd prime.at n=26A179321
• Smallest palindromic numbers of length 4 in two bases differing by n.at n=8A216843
• E.g.f.: A(x) = x + tan(A(x)^2).at n=5A226759
• Expansion of phi(x)^2 / phi(-x^2) in powers of x where phi() is a Ramanujan theta function.at n=35A260314
• p-INVERT of (0,1,0,1,0,1,...), where p(S) = 1 - S^2 - S^3.at n=18A291222
• T(n, k) = [x^k] 2^n*(Euler(n, x) - Euler(n, x/2)), where Euler(n, x) are the Euler polynomials. Triangle read by rows, T(n, k) for 0 <= k <= n.at n=62A342315
• Numbers k such that A276086(k)-1 or A276086(k)+1 is a perfect power (A001597), where A276086 is the primorial base exp-function.at n=34A379960
• Numbers k such that A276086(k)+1 is a perfect power (A001597), where A276086 is the primorial base exp-function.at n=20A379962
• Numbers k such that A276086(k)+1 is a perfect square (A000290), where A276086 is the primorial base exp-function.at n=15A379963
• Numbers k such that A380845(k) > 3*k.at n=20A380930