70091

Appears in sequences

• Expansion of Product_{k>=1} (1-x^k)^31.at n=6A010836
• Numbers n such that sigma(n)/phi(n) = 16/9.at n=3A164647
• Numbers n such that n and n+-1 have 4 distinct prime factors.at n=14A168628
• a(n) = a(n-1) * (11*a(n-1) - 16*a(n-2)) / (a(n-1) + 10*a(n-2)) with a(1) = 1, a(2) = 2.at n=8A247518
• a(n) = (1/720)*n*(n - 10)*(n - 1)*(n^3 - 34*n^2 + 181*n - 144).at n=31A319932
• Tetraprimes (or products of exactly four distinct prime numbers) that are the sum of two successive tetraprimes.at n=35A380348