676500

Appears in sequences

• Enneagonal numbers for which both the sum of the digits and the product of the digits are also enneagonal numbers.at n=21A117053
• a(1)=1. For n>1, a(n) equals the smallest number > a(n-1) of the form a(k) U j U a(k) U j, where U represents concatenation (written in decimal) of the binary representation of the arguments, where 1<=k < n, and j = {0} or {1} or {}.at n=24A175336