A241920 After a(1)=1, each n appears A061395(n) times, where A061395 gives the index of the largest prime factor of n.

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

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