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A251618 Smallest term in A098550 having prime(n) as a factor. 3
2, 3, 15, 14, 22, 39, 51, 38, 69, 87, 62, 74, 123, 86, 94, 106, 118, 122, 201, 142, 146, 158, 249, 178, 291, 202, 206, 214, 218, 226, 254, 262, 274, 278, 298, 302, 314, 326, 334, 346, 358, 362, 382, 386, 394, 398, 422, 446, 454, 458, 466, 478, 482, 502, 514 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Largest prime factor of a(n) = prime(n);

a(n) is composite for n > 2;

first column in A251637;

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

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

LINKS

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

PROG

(Haskell)

import Data.List (find); import Data.Maybe (fromJust)

a251618 n = fromJust $

            find (\x -> mod x (fromIntegral $ a000040 n) == 0) a098550_list

CROSSREFS

Cf. A098550, A000040, A251637, A251619 (smallest prime factor), A006530.

Sequence in context: A075244 A088030 A101047 * A309765 A238691 A241721

Adjacent sequences:  A251615 A251616 A251617 * A251619 A251620 A251621

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Dec 07 2014

STATUS

approved

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Last modified October 28 21:20 EDT 2020. Contains 338064 sequences. (Running on oeis4.)