207984

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 19.at n=25A031697
• a(n) = 361*n^2 + 2*n.at n=23A158309
• Numbers n such that n and n^4 are sums of two twin primes.at n=29A212430
• Sum of all parts of all overpartitions of n.at n=20A235793
• E.g.f.: Sum_{n>=0} x^n/n! * Product_{k=1..n} (n+1-k) + k*x.at n=7A316370
• a(n) = Sum_{k=1..n} floor(n/k)^4.at n=20A318743