77777777777
domain: N
Appears in sequences
- a(n) = 7*(10^n - 1)/9.at n=11A002281
- Worthless numbers: numbers without h, o, r, t, or w.at n=24A073419
- Smallest number using a single digit with multiplicity such that every partial concatenation is prime.at n=11A089335
- a(n) = smallest palindrome > a(n-1) (for n > 0) such that the sum of its prime digits is equal to palindrome with index n, or -1 if none exists.at n=16A114996
- Repdigit numbers with repdigit digital sum.at n=30A201061
- Largest k such that no sum of digits is divisible by n (zeros not allowed in the digits of k).at n=10A231155
- Sphenic numbers having identical digits.at n=19A268582
- Repdigit numbers that are divisible by 7.at n=19A366596