33379

Appears in sequences

• Number of fountains of n coins.at n=21A005169
• T(n,n) + T(n,n+1) + ... + T(n,2n), T given by A027082.at n=10A027098
• Apocalypse primes: 10^665+a(n) has 666 decimal digits and is prime.at n=20A115983
• Semiprime terms in A136047.at n=13A136048
• a(n) = (1+n)*(9 + 11*n + 4*n^2)/3.at n=28A172482
• Numerator of sum of reciprocals of all divisors of all positive integers <= n.at n=8A284648
• Number of subsets of {1..n} containing no sums or products of pairs of elements.at n=24A326495