23469

Appears in sequences

• Offsets for the Atkin Partition Congruence theorem.at n=49A036492
• Numbers having four 5's in base 8.at n=29A043444
• Number of involutions of length n having exactly n inversions.at n=15A214086
• Odd numbers k such that phi(k) and cototient(k) have the same prime signature.at n=33A280927
• Expansion of exp( Sum_{n>=1} -sigma_3(n)*x^n/n ) in powers of x.at n=18A283263
• Numbers without a digit 1 with digits in nondecreasing order and the product of digits is a power of 6.at n=27A304392
• Numbers whose sum of even digits and sum of odd digits are equal and whose digits are in nondecreasing order.at n=42A340125
• Number of reversed integer partitions of 2n whose skew-alternating sum is 0.at n=26A357640
• a(n) = Sum_{k=0..floor(n/2)} 2^(n-2*k) * binomial(2*k+1,2*n-4*k+1).at n=16A387651