123633

Appears in sequences

• Number of n X 4 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=17A207064
• Denominator of best rational approximation x/y of log(k), y<=k, with k>1 given by A306975. The corresponding numerators are given in A306976.at n=28A306977
• Odd numbers k such that k and k+2 both have at least two divisors with the same value of the Euler totient function (A000010).at n=6A373527