33901

Appears in sequences

• Number of sequences s of length n, with s[1]=1, s[2]=1, s[3]=1, s[k-1] <=s[k] <= s[k-1]+s[k-2]+s[k-3] (s is called a sub-tribonacci sequence of length n).at n=6A128094
• Numbers k = p*q*r (p, q, r prime) congruent to 0 mod p+q+r.at n=31A160394
• Composite numbers n such that E(n+1)+1 is divisible by n, where E(n) is the n-th Euler number (A122045).at n=24A287934
• Odd squarefree composite numbers k, divisible by the sum of their prime factors, sopfr (A001414).at n=22A308643
• Number of 4-element subsets of [n] having a prime element sum.at n=42A320679
• Numbers m such that sigma(m) = tau(m)! where sigma(k) = A000203(k) and tau(k) = A000005(k).at n=25A351866
• a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(j*k).at n=22A372633
• Number of partitions of n that do not have a fixed point that is also a fixed point of the conjugate partition.at n=41A374782