21765

Appears in sequences

• Numbers k such that 231*2^k+1 is prime.at n=46A032492
• Base-7 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,0,3.at n=5A037691
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 1), (0, 0, -1), (0, 1, 1), (1, 0, 0)}.at n=8A150197
• a(n) is the number of terms in the expansion of (x-y)*(x^4-y^4)*(x^9-y^9)*...*(x^(n^2)-y^(n^2)).at n=39A225549
• Number of (n+1)X(4+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.at n=5A233405
• Number of (n+1)X(6+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.at n=3A233407
• T(n,k) = Number of (n+1) X (k+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.at n=39A233408
• T(n,k) = Number of (n+1) X (k+1) 0..2 arrays with row and column sums nondecreasing, and no adjacent elements equal.at n=41A233408
• Number of length n+5 0..2 arrays with at most one downstep in every n consecutive neighbor pairs.at n=8A255112