56127

Appears in sequences

• Products of three distinct primes p1, p2 and p3 (sphenic numbers) with p1<p2 and p3 is the concatenation of p1 with p2.at n=14A281592
• G.f.: Sum_{n>=0} (n+1)*(n+2)/2 * (x + x^n)^n.at n=53A325998
• Values of k at which the ratio k/A005132(k) sets a new record.at n=11A330788
• a(n) = greatest number of unrestricted partitions between successive strict partitions of n, with partitions listed in Mathematica order.at n=56A366883
• Number of deranged matchings of 2n people with partners (of either sex) such that at least one person is matched with their spouse.at n=7A370253
• Number A(n,k) of partitions of [k*n] into n sets of size k having at least one set of consecutive numbers whose maximum (if k>0) is a multiple of k; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=52A370363