22620

Appears in sequences

• Number of compositions of n into 5 ordered relatively prime parts.at n=25A000743
• a(n) = n^4 + n^3 + n^2 + n.at n=12A027445
• Sums of distinct powers of 12.at n=30A033048
• Triangle read by rows: T(n,k) is number of hex trees with n edges and level of first leaf (in the preorder traversal) equal to k (1 <= k <= n).at n=39A126186
• Numbers that are divisible by the product of the digit-sums of their neighbors.at n=34A152826
• Number of simple acyclically oriented Mobius arrangements of pseudolines of order n.at n=4A191946
• Number of nX4 0..1 arrays with every row and column least squares fitting to a nonnegative slope straight line, with a single point array taken as having zero slope.at n=4A222858
• Number of nX5 0..1 arrays with every row and column least squares fitting to a nonnegative slope straight line, with a single point array taken as having zero slope.at n=3A222859
• Table read by antidiagonals: T(n,k) is the number of n X k 0..1 arrays with every row and column least squares fitting to a nonnegative-slope straight line, with a single point array taken as having zero slope.at n=31A222862
• Table read by antidiagonals: T(n,k) is the number of n X k 0..1 arrays with every row and column least squares fitting to a nonnegative-slope straight line, with a single point array taken as having zero slope.at n=32A222862
• Averages q of twin prime pairs, such that q concatenated to q is also the average of a twin prime pair.at n=28A235109
• Least integer k>1 such that sqrt(k)/log(k) exceeds n.at n=14A262058
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 51", based on the 5-celled von Neumann neighborhood.at n=31A270020
• Numbers k such that k+1 is a prime, k+2 is twice a prime, and k+3 is three times a prime.at n=43A278583
• Numbers k such that k = Sum_{i=1..j} Sd(k)^i, for some j>0, where Sd(k) is the sum of the digits of k.at n=23A286126
• Numbers k that are multiples of the digital sum of k-1, k and k+1.at n=33A303068
• a(n) is the least k that is a multiple of A071395(n) (the n-th primitive abundant number) for which A003961(k) is abundant.at n=38A337469
• Irregular table read by rows: The number of k-faced polyhedra, where k >= 4, created when an n-bipyramid, formed from two n-gonal pyraminds joined at the base, is internally cut by all the planes defined by any three of its vertices.at n=47A338825
• a(n) is the smallest number which can be represented as the sum of n distinct nonzero squares in exactly 2 ways, or -1 if no such number exists.at n=39A374287
• Unitary s-Zumkeller numbers.at n=37A384515