22831

Appears in sequences

• The game of Mousetrap with n cards: the number of permutations of n cards having at least one hit after 2.at n=8A002468
• [ (4th elementary symmetric function of P(n))/(2nd elementary symmetric function of P(n)) ], where P(n) = {first n+3 primes}.at n=16A024456
• Numbers n such that the sum of the prime factors of n equals the product of the digits of n.at n=30A067173
• a(n) = n^2 + 731*n + 1.at n=30A180919
• Number of partitions p of n such that (# 1s in p) = (#1s in conjugate(p)).at n=51A240691
• Triangle read by rows: T(n,k) is the number of bargraphs of semiperimeter n having k levels. A level in a bargraph is a maximal sequence of two or more adjacent horizontal steps; it is preceded and followed by either an up step or a down step.at n=37A273344
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 771", based on the 5-celled von Neumann neighborhood.at n=26A273500
• a(0) = 32; then, for n >= 1, a(n) is the smallest positive integer k such that pod(k^2)/pod(k) = A002473(n) where pod = product of digits = A007954.at n=51A351809
• Starts of runs of 3 consecutive integers whose exponent of least prime factor in their prime factorization is even.at n=39A365871