30021

Appears in sequences

• Fibonacci sequence beginning 1, 11.at n=18A022101
• Numbers n such that n divides the (left) concatenation of all numbers <= n written in base 19 (most significant digit on right and removing all least significant zeros before concatenation).at n=23A029536
• Coefficients of the D-Dyson mod 27 identity.at n=44A104504
• a(1) = 1; thereafter, a(n) is always the smallest integer > a(n-1) not leading to a contradiction, such that any three consecutive digits in the sequence sum up to a prime.at n=45A152603
• The smallest magic constant of an n X n magic square with distinct prime entries.at n=18A164843
• Number of integers in n-th generation of tree T(3^(-1/3)) defined in Comments.at n=57A274159