19594

Appears in sequences

• a(n) = floor(3rd elementary symmetric function of Sum_{j=1..k} 1/j, k = 1,2,...,n).at n=16A025213
• a(n) = 2*prime(n)*prime(n+1).at n=24A069486
• Sum of smallest parts (counted with multiplicity) of all partitions of n into odd parts.at n=45A092313
• Total number of even parts in the last section of the set of partitions of n.at n=37A206434
• For every positive integer m, let u(m) = (d(1),d(2),...,d(k)) be the unitary divisors of m. The sequence (a(n)) consists of integers of the form d(k)/d(1) + d(k-1)/d(2) + ... + d(k)/d(1).at n=12A229999
• Number of excursions of length n with Motzkin-steps avoiding the consecutive steps UD and HH.at n=18A329676
• Number of semi-lone-child-avoiding locally disjoint rooted trees with n vertices.at n=19A331872
• a(1) = 12; for n >= 2, a(n) = least positive integer of the form prime(m)*prime(n-m)*prime(n) with m >= 1.at n=25A364434
• a(n) = number of pairs {x,y} with (x,y > 1) such that x^y (= terms of A072103) has bit length n.at n=31A365930