30267

Appears in sequences

• a(n) = 1*prime(n) + 2*prime(n-1) + ... + k*prime(n+1-k), where k=floor((n+1)/2) and prime(n) is the n-th prime.at n=43A023870
• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (natural numbers), t = (primes).at n=42A024867
• Denominators of continued fraction convergents to sqrt(581).at n=11A042113
• Numbers k such that sopf(k) = sopfr(k+1), where sopf(k) = A008472(k) and sopfr(k) = A001414(k).at n=31A064678
• Number of partitions of n into squarefree parts.at n=49A073576
• 45-gonal numbers: n*(43*n-41)/2.at n=37A098924
• Expansion of Product_{k>=1} 1/(1 - x^k * (1 - x)).at n=42A306749
• G.f.: Sum_{n>=0} (n+1)*(n+2)/2 * x^n * (1 + x^n)^n.at n=74A326003
• Inverse Mobius transformation of A034714.at n=47A360429