307000

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 77 ones.at n=24A031845
• Take a number z of x digits and consider any concatenation z = concat(y_1, y_2, ..., y_i) where y_1, y_2, ..., y_i have the same number of digits. Then be g(z) the product of the sums y_1 + y_2 + ... + y_i for all those concatenations. Sequence lists numbers z such that g(g(z)) = z. (See example.)at n=3A317628