23233

Appears in sequences

• Numbers k that divide s(k), where s(1)=1, s(j)=21*s(j-1)+j.at n=41A014872
• Array T(n,k) = number of subgroups of index k in free group of rank n, read by antidiagonals.at n=30A049290
• Number of subgroups of index 3 in free group of rank n+1.at n=5A049294
• Self-describing integers with the rule: if the digit d, part of the integer i, is odd then there are d odd digits in this integer; if the digit d is even there are d even digits.at n=9A105776
• Any digit d in the sequence says: "I am part of an integer in which you'll find d digits d".at n=13A108571
• Semiprimes in A056107.at n=22A113525
• Numbers such that the sum of the factorials of the digits of the fourth power is a square.at n=33A126077
• Numbers of the form 6*k+1 that use only digits 2 and 3.at n=5A152834
• a(n) = 48*n^2 + 1.at n=22A158638
• Decimal representation of the reverted binary representation of n followed by digits substitution 0->2, 1->3.at n=26A176892
• Centered 44-gonal numbers.at n=32A195318
• List of primitive words over the alphabet {2,3}.at n=32A213971
• Odd composite numbers n, such that n, n+d, n*d and n/d are all odious (A000069) for every divisor d of n.at n=35A231558
• Number of length n+2+2 0..2 arrays with every value 0..2 appearing at least once in every consecutive 2+3 elements, and new values 0..2 introduced in order.at n=8A242317
• Numbers which have d digits "d", whenever one of their digits is "d", ordered by largest digit, then by size of the number.at n=11A247700
• Numbers k such that the reverse of the first k digits in the decimal expansion of Pi forms a prime.at n=12A282183
• Positive integers that have exactly ten representations of the form 1 + p1 * (1 + p2* ... * (1 + p_j)...), where [p1, ..., p_j] is a (possibly empty) list of distinct primes.at n=26A317400
• Expansion of e.g.f. exp(Sum_{i>=1} Sum_{j=1..i-1} x^(i*j) / (i*j)).at n=8A327940
• Numbers k that are the representation of primes in base 4 and in base 5.at n=26A359840