22223

Appears in sequences

• Numbers using only digits 2 and 3.at n=31A032810
• Numbers whose maximal base-10 run length is 4.at n=31A033285
• Start with 1; for n>1, replace n with the concatenation of its prime factors in increasing order.at n=47A037276
• Numbers having four 2's in base 10.at n=10A043500
• If n is not composite, a(n) = n followed by 1; if n is composite, a(n) = concatenation of prime factors of n.at n=48A049201
• a(n) is the number k, 2^n < k < 2^(n+1), such that k/c(k) is a minimum in the interval, where c(k) is Hofstadter-Conway sequence A004001.at n=13A051284
• Least number formed by concatenating the prime factors of n in base 10.at n=47A073646
• Jacobsthal sequence (A001045) as represented in base 4.at n=11A081857
• Lunar fourth powers: n*n*n*n, where * is lunar multiplication.at n=23A087051
• Concatenation of n 2's followed by 3.at n=3A091628
• Expansion of g.f. (1-8*x)/((1-x)*(1-10*x)).at n=5A093135
• a(1) = 1, a(2) = 2; for n >= 2, a(n+1) = a(n) + sum of the unique prime factors of a(n).at n=27A096460
• a(1)=1. a(n) = a(n-1) + sum of the triangular numbers which are among the first (n-1) terms of the sequence.at n=38A100963
• Near-repdigit semiprimes with 2 as repeated digit.at n=15A105983
• Merging prime factors of n-th composite number.at n=31A119603
• Numbers n such that n and prime(n) contain prime digits only.at n=11A155088
• INVERT transform of A000055.at n=13A157904
• Decimal representation of the reverted binary representation of n followed by digits substitution 0->2, 1->3.at n=16A176892
• List of primitive words over the alphabet {2,3}.at n=22A213971
• a(1) = 1; for n > 1: a(n) = smallest odd number greater than a(n-1) which does not use any digit used by a(n-1).at n=30A229364