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A241920 After a(1)=1, each n appears A061395(n) times, where A061395 gives the index of the largest prime factor of n. 3
1, 2, 3, 3, 4, 5, 5, 5, 6, 6, 7, 7, 7, 7, 8, 9, 9, 10, 10, 10, 11, 11, 11, 11, 11, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 16, 17, 17, 17, 17, 17, 17, 17, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Only numbers that occur just once are the powers of two (A000079).

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10081

PROG

(Scheme, with Antti Karttunen's IntSeq-library)

(define A241920 (COMPOSE-FUNS (LEAST-GTE-I 0 1 A203623) -1+))

CROSSREFS

Cf. A082288, A061395, A203623, A067255, A241918, A241914, A241915.

Sequence in context: A267861 A253548 A083036 * A202305 A195778 A165706

Adjacent sequences:  A241917 A241918 A241919 * A241921 A241922 A241923

KEYWORD

nonn

AUTHOR

Antti Karttunen, May 01 2014

STATUS

approved

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Last modified August 8 19:29 EDT 2020. Contains 336298 sequences. (Running on oeis4.)