24956

Appears in sequences

• Number of lines through exactly 4 points of an n X n grid of points.at n=42A018811
• Sum of a(n) terms of 1/k^(5/6) first exceeds n.at n=27A056181
• a(n) = n*(n-1)*(n^3 + 21*n^2 - 4*n + 96)/120.at n=17A124161
• 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, 1, 0), (1, 0, -1), (1, 0, 0), (1, 1, 0)}.at n=8A150330
• Number of (n+2)X(n+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=4A252184
• Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.at n=4A252189
• Numbers n such that sigma(n) is a Fibonacci number.at n=17A272412
• Numbers k such that 8*10^k - 67 is prime.at n=18A294380
• a(n) = Sum_{k=1..n} sigma_2( n/gcd(k,n) ).at n=31A372226