2456789

Appears in sequences

• Nonzero digits not used in n.at n=13A180408
• Smallest number with n = sum of distinct digits in decimal representation, cf. A217928.at n=41A227378
• a(n) is the concatenation of the numbers k, 2 <= k <= 9, such that the base-k representation of n, read as a decimal number, is prime; a(n) = 0 if there is no such base.at n=2A236356
• a(n) is the concatenation of the numbers k, 2 <= k <= 9, such that the base-k representation of n is a palindrome; a(n) = 0 if there is no such base.at n=2A236366