11111121

Appears in sequences

• a(1) = 1, then the smallest number not included earlier and not a string of 1's such that the concatenation a(n), a(n+1) is a palindrome.at n=21A083122
• a(n) is the smallest integer that contains a(n-1) but does not begin with a(n-1).at n=7A179956
• Numbers with digital product = 2.at n=29A199986
• Composite numbers whose product of digits is 2.at n=22A201015
• Unique representation of nonnegative numbers by iterated tribonacci A, B and C sequences.at n=44A316713
• a(n) is the smallest proper multiple of n whose digit product is the same as the digit product of n; 0 if no such number exists.at n=20A340204