22939

Appears in sequences

• Numbers k such that 105*2^k+1 is prime.at n=44A032402
• Odd composite numbers which in base 2 contain their largest proper factor as a substring of digits.at n=29A063131
• Numbers n such that n*(n+1)/2 is the juxtaposition of two identical strings in binary representation.at n=35A092739
• Numbers k such that A003313(k) = A003313(5*k).at n=6A116460
• a(n) = 2*a(n-1) - a(n-2) + 2*a(n-3), with a(0) = 2, a(1) = 2.at n=14A135541
• 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), (1, -1, 0), (1, 0, -1), (1, 1, 1)}.at n=8A149710
• Sum of the sizes of the Durfee squares of all partitions of n that do not contain 1 as a part, but with a(1) = 1.at n=39A208474
• Number of n-bead necklaces labeled with numbers -4..4 not allowing reversal, with sum zero and three times sum of squares <= n*(4)*(4+1).at n=6A208810
• T(n,k)=Number of n-bead necklaces labeled with numbers -k..k not allowing reversal, with sum zero and three times sum of squares <= n*k*(k+1).at n=51A208814
• Number of nX3 0..1 arrays with every element unequal to 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.at n=8A304151
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.at n=57A304156
• Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.at n=11A304474
• T(n,k)=Number of nXk 0..1 arrays with every element unequal to 2, 3, 4, 6 or 8 king-move adjacent elements, with upper left element zero.at n=57A305509