17777777

Appears in sequences

• Replace each 1 in decimal expansion of n with 1 1's, each 2 with 2 2's, etc. (0 vanishes).at n=16A048376
• Smallest semiprime containing exactly n 7's.at n=6A104760
• Smallest semiprime ending in exactly n 7's.at n=6A106662
• a(n) = (16*10^n - 7)/9.at n=7A246058
• Numbers whose digits are nondecreasing and which have exactly d digits "d" whenever there is at least one digit "d".at n=20A247701