85577

Properties

Appears in sequences

• a(1)=3, b(n) = Product_{k=1..n} a(k), a(n+1) is the smallest prime factor of b(n)-1.at n=26A005265
• a(1) = 2, a(2) = 3; for n >= 2, a(n+1) is smallest prime factor of (Product_{k = 1..n} a(k)) - 1.at n=26A084598
• a(n) = number of Egyptian fractions 1 = 1/x_1 + ... + 1/x_k (for any k), 0<x_1<...<x_k=n.at n=59A092669
• Nonzero elements of A092669.at n=20A092672
• a(n) = 139*n^2 - 2307*n + 3331.at n=34A230307
• Primes having only {5, 7, 8} as digits.at n=32A260830
• Prime numbersat n=8328