63531

Appears in sequences

• Number of planar triangular n X n X n nonnegative integer grids symmetric under 120 degree rotation with every similarly oriented 5 X 5 X 5 subtriangle summing to 15.at n=6A154093
• a(n) = (2*n^3 + 5*n^2 + 21*n)/2.at n=38A162266
• Integers n such that (25*10^n)+1 is prime.at n=12A171612
• a(1) = a(2) = 1; a(n) = gcd(a(n-1), a(n-2)) + (a(n-1) + a(n-2))/gcd(a(n-1), a(n-2)).at n=40A355898
• Number of integer compositions of n whose leaders of strictly increasing runs are distinct.at n=27A374687