2222222

Appears in sequences

• a(n) = 2*(10^n - 1)/9.at n=7A002276
• Digital representation of m contains only either 1's or 2's (but not both 1's and 2's) and 0's, is palindromic and contains no singleton 2's, 1's or 0's.at n=15A061852
• Geometric mean of digits = 2 and digits are in nondecreasing order.at n=29A069512
• Repdigits (A010785) ordered by sum of digits (A007953).at n=35A070840
• Repdigits (A010785), excluding repunits (A002275), ordered by product of digits (A007954).at n=24A070841
• Squarefree numbers obtained by repeating a single digit.at n=32A077571
• Palindromes p such that 5p + 1 is also a palindrome.at n=21A083833
• a(n) = 0^n + ((n-9)/9)*(1-10^n).at n=7A091686
• A Jacobsthal sequence (A078008) to base 4.at n=15A092900
• Expansion of x*(1+x)/((1-x)*(1-10*x^2)).at n=14A094626
• Base 3 representation of the positive integers n such that Sum[d[k],k=1..n] is an integer, where d(k) is the base 3 fraction 0.k (e.g., d(22 base 10)=d(211 base 3)=0.221 base 3).at n=8A107483
• Longest sequence of distinct integers such that the length of the n-th term is given by the n-th digit of the sequence itself.at n=17A108718
• 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=22A115778
• List of imprimitive words over the alphabet {1,2}.at n=21A213972
• List of imprimitive words over the alphabet {2,3}.at n=20A213974
• Numbers n such that the cardinality of (natural numbers <=n with a first digit of 1) = n/2.at n=12A228158
• Sphenic numbers having identical digits.at n=12A268582
• Expansion of x*(1 + 2*x + 10*x^2)/((1 - x^2)*(1 - 10*x^2)).at n=14A322925
• Array read by ascending antidiagonals: A(n, k) = k*(10^n - 1)/9 with k >= 0.at n=47A365644
• Array read by downward antidiagonals: T(k,n) is the least number that has k prime factors (counted with multiplicity) and is the concatenation of n primes, or -1 if there is no such number.at n=38A374376