121600

Appears in sequences

• Let S denote the palindromes in the language {0,1,2,3}*; a(n) = number of words of length n in the language SS.at n=12A007057
• Theta series of lattice Kappa_9.at n=15A015233
• Numbers n such that n divides the (right) concatenation of all numbers <= n written in base 13 (most significant digit on right).at n=26A029506
• Array A(i,j) read by antidiagonals: A(i,j) is the (2i-1)-th derivative of sin(sin(sin(...sin(x)))) nested j times evaluated at 0.at n=32A212261
• a(n) = largest k such that A049820(k) <= A262509(n).at n=23A263083
• Numbers k such that sigma(sigma(k^4)) == 0 (mod k^2).at n=35A320425
• Square array read by descending antidiagonals: (-1)^n*T(n,k)/n! is the coefficient of x^(2*n+1) in the Taylor expansion of the k-th iteration of sin(x).at n=40A366834