222222222

Appears in sequences

• a(n) = 2*(10^n - 1)/9.at n=9A002276
• a(n) = 12345679*n.at n=18A070189
• Repdigits (A010785), excluding repunits (A002275), ordered by product of digits (A007954).at n=31A070841
• Nonsquarefree numbers obtained by repeating a single digit.at n=30A077572
• Smallest multiple of n using only digits 0 and 2.at n=8A078241
• Smallest multiple of n using only digits 0 and 2.at n=17A078241
• A Jacobsthal sequence (A078008) to base 4.at n=19A092900
• a(1)=1, a(n) = 2*(n^(n-1)-1)/(n-1) for n >= 2.at n=9A093461
• Expansion of x*(1+x)/((1-x)*(1-10*x^2)).at n=18A094626
• 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=19A108718
• a(n) is the least positive integer in base 10 containing n twos that is divisible by n.at n=8A112893
• 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=28A115778
• a(n) = 111111111 * n.at n=1A172525
• In base 10 lunar arithmetic, a(n) is the smallest number than has exactly n different square roots (or -1 if no such number exists).at n=2A202174
• a(n) is the least multiple of n which uses only digit 2, or a(n) = -1 if no such multiple exists.at n=8A216481
• a(n) is the least multiple of n which uses only digit 2, or a(n) = -1 if no such multiple exists.at n=17A216481
• Smallest positive number divisible by n whose decimal expansion has the form 22...200...0.at n=8A216812
• Smallest positive number divisible by n whose decimal expansion has the form 22...200...0.at n=17A216812
• Numbers n such that the cardinality of (natural numbers <=n with a first digit of 1) = n/2.at n=16A228158
• Repdigit numbers that are divisible by 3.at n=38A305322