A251619 Smallest prime factor of smallest multiple of prime(n) in A098550.

2, 3, 3, 2, 2, 3, 3, 2, 3, 3, 2, 2, 3, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2

Offset: 1

Author

Reinhard Zumkeller, Dec 07 2014

Keywords

• nonn

Comments

a(n) = A020639(A251618(n));

for n > 2: a(n) = A251715(n,1);

conjecture: for n > 2: a(n) = 2 or a(n) = 3;

conjecture: for n > 25: a(n) = 2.

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A098550, A020639, A251618, A251715.

Programs

Haskell

a251619 = a020639 . fromIntegral . a251618