136457

Appears in sequences

• a(n) = Sum_{k=1..n} binomial(k+3,3) * floor(n/k).at n=38A366985
• a(n) = numerator(Sum_{k=1..n} 1/P(k)), where P(k) = A006530(k) is the greatest prime dividing k for k >= 2, and P(1) = 1.at n=12A378678
• a(n) is the least k such that the residues mod 3 of the primes prime(k), prime(k+1), ... comprise a string of n 2's followed by 1.at n=10A391796