89737

Appears in sequences

• Numbers k that are the products of two distinct primes such that 2*k-1, 4*k-3, 8*k-7, 16*k-15, 32*k-31, 64*k-63 and 128*k-127 are also products of two distinct primes.at n=10A177216
• Expansion of e.g.f. exp(2*x + 3*x^2/2).at n=8A202830
• Triangle read by rows: T(n,k) is the number of subpermutations of an n-set whose orbits are each of size at most k.at n=38A261763