18003

Appears in sequences

• Sum of digits in n-th term of A006711.at n=32A022480
• Numbers n such that sigma(phi(n)) = sum of anti-divisors of n.at n=4A074835
• Number of n X n binary arrays with rows and columns, considered as graycode numbers, in strictly increasing order.at n=4A162118
• Number of n X n binary arrays with rows and columns, considered as graycode numbers, in strictly increasing order, and no more than 5 ones in any row or column.at n=4A162122
• Number of n X n binary arrays with rows and columns, considered as graycode numbers, in strictly increasing order, and no more than 6 ones in any row or column.at n=4A162123
• Number of n X n binary arrays with rows and columns, considered as graycode numbers, in strictly increasing order, and no more than 7 ones in any row or column.at n=4A162124
• Number of n X n binary arrays with rows and columns, considered as graycode numbers, in strictly increasing order, and no more than 8 ones in any row or column.at n=4A162125
• Number of n X n binary arrays with rows and columns, considered as graycode numbers, in strictly increasing order, and no more than 9 ones in any row or column.at n=4A162126
• Positions of zeros in A165597.at n=27A165598
• a(n) = 20*n^2 + 3.at n=29A167573
• Number of (w,x,y) with all terms in {0,...,n} and w<x+y and x<=y.at n=34A212982
• Decimal representation of the middle column of the "Rule 75" elementary cellular automaton starting with a single ON (black) cell.at n=14A266897
• Number of permutations of [n] avoiding {1324, 2413, 3421}.at n=10A294803
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A385060.at n=41A385063