230496

Appears in sequences

• Array defined in A064643 read from left to right (cf. A107783).at n=39A064644
• Array defined in A064643 read in direction in which it was created.at n=39A107783
• a(1) = 1, a(2) = 6, for n >= 3; a(n) = the smallest number greater than a(n-1) such that [[a(n-2) + a(n-1)] * [a(n-2) + a(n)] * [a(n-1) + a(n)]] / [a(n-2) * a(n-1) * a(n)] is an integer.at n=9A182752
• Number of 2 X 2 matrices with all elements in {0,1,...,n} and odd determinant.at n=27A210370
• Number of 2 X 2 matrices having all terms in {1,...,n} and odd determinant.at n=27A211065
• Number of solutions to gcd(x^2 + y^2 + z^2 + t^2 + h^2, n) = 1 with x,y,z,t,h in [0,n-1].at n=13A238533
• a(n) = phi(6^n+1), where phi is Euler's totient function (A000010).at n=7A366630