22222222222
domain: N
Appears in sequences
- a(n) = 2*(10^n - 1)/9.at n=11A002276
- Numbers k such that k*(k+5) is a palindrome.at n=24A028558
- Repdigit + 1 is prime.at n=12A028988
- Repdigits (A010785), excluding repunits (A002275), ordered by product of digits (A007954).at n=38A070841
- a(n) = (10^(n-1)-1) * (n-10) / 9.at n=12A091691
- A Jacobsthal sequence (A078008) to base 4.at n=23A092900
- Expansion of x*(1+x)/((1-x)*(1-10*x^2)).at n=22A094626
- Consider the Levenshtein distance between k considered as a decimal string and k considered as a binary string. Then a(n) is the least number m such that the Levenshtein distance is n or 0 if no such number exists.at n=35A115778
- Repdigit numbers with repdigit digital sum.at n=25A201061
- Numbers n such that the cardinality of (natural numbers <=n with a first digit of 1) = n/2.at n=20A228158
- Sphenic numbers having identical digits.at n=16A268582
- Expansion of x*(1 + 2*x + 10*x^2)/((1 - x^2)*(1 - 10*x^2)).at n=22A322925
- Happy repdigit numbers.at n=12A381046