1,1

It is known that every prime divides some term of A098550, so the sequence exists.

Conjectures. 1: Equals first column of A251716. 2: For n > 4, a(n) = A251239(n) - 2. - Reinhard Zumkeller, Dec 15 2014

Reinhard Zumkeller, Table of n, a(n) for n = 1..3000 (First 500 terms from N. J. A. Sloane)

Cf. A098550, A251239, A251544, A251716.

Cf. A253297.

Sequence in context: A166966 A247843 A181658 * A325105 A276032 A114281

Adjacent sequences: A251538 A251539 A251540 * A251542 A251543 A251544

nonn

N. J. A. Sloane, Dec 15 2014

approved