18516

Appears in sequences

• Rotating digits of a(n)^2 right once still yields a square.at n=16A045877
• Numbers k such that x^k + x^9 + 1 is irreducible over GF(2).at n=45A057479
• Seventh convolution of A001045(n+1) (generalized (1,2)-Fibonacci), n>=0, with itself.at n=6A073377
• Starting positions of strings of three 7's in the decimal expansion of Pi.at n=18A083631
• a(n+2) = 34*a(n+1) - a(n) + 2; a(1) = 1 and a(2) = 16.at n=3A131515
• a(n) = 529*n + 1.at n=34A158368
• Number of lines through at least 2 points of a 7 X n grid of points.at n=41A160847
• G.f.: A(x) = x/(1 - (1-3x)*A( x/(1-3x) )).at n=7A179489
• Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=11A253431
• Number of (4+1) X (n+1) 0..1 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=11A253438
• Let p = n-th prime == 3 mod 8; a(n) = sum of quadratic nonresidues mod p that are > p/2.at n=16A282725
• Number of pentagons in the graph formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares).at n=41A332608