31323

Appears in sequences

• Tribonacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) with a(0)=3, a(1)=4, a(2)=5.at n=16A280308
• Numbers p_1*p_2*...*p_k such that (2^p_1-1)*(2^p_2-1)*...*(2^p_k-1) is a Poulet number (A001567), where p_i are primes and k >= 2.at n=19A291617
• Number of balanced reduced multisystems whose atoms cover an initial interval of positive integers with multiplicities equal to the prime indices of n.at n=38A318846