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A251619 Smallest prime factor of smallest multiple of prime(n) in A098550. 3
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 (list; graph; refs; listen; history; text; internal format)
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: A269043 A309952 A059252 * A030620 A110764 A107901

Adjacent sequences:  A251616 A251617 A251618 * A251620 A251621 A251622

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Dec 07 2014

STATUS

approved

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Last modified October 27 19:59 EDT 2020. Contains 338036 sequences. (Running on oeis4.)