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

1,1

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

Prog

(Haskell)
a251619 = a020639 . fromIntegral . a251618

Crossrefs

Cf. A098550, A020639, A251618, A251715.

Sequence in context: A309952 A059252 A349319 * A030620 A348241 A110764

Adjacent sequences: A251616 A251617 A251618 * A251620 A251621 A251622

Keyword

nonn

Author

Reinhard Zumkeller, Dec 07 2014

Status

approved