212400

Appears in sequences

• a(n) = p(p+1)^2, where p is the n-th prime.at n=16A178398
• Exponential Riordan array (e^(mx),x*A000108(x)), m=3.at n=62A185948
• Molecular topological indices of the complete bipartite graphs K_{n,n}.at n=29A192418
• Bi-unitary deficient-perfect numbers: bi-unitary deficient numbers k for such that 2*k - bsigma(k) is a bi-unitary divisor of k, where bsigma(k) is the sum of bi-unitary divisors of k (A188999).at n=40A303358
• Coreful triperfect numbers: numbers k such that csigma(k) = 3*k, where csigma(k) is the sum of the coreful divisors of k (A057723).at n=16A364990
• a(n) = Sum_{k=0..floor(n/3)} binomial(k+2,2) * binomial(k,n-3*k)^2.at n=29A377147
• Integers k with at least one proper factorization for which the sum of the same fixed integer power >= 2 of the factors equals k.at n=31A380760
• Exponential abundant numbers that are not exponential unitary abundant.at n=29A391085
• Exponential Zumkeller numbers that are not exponential unitary Zumkeller numbers.at n=32A391090