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

Author

Antti Karttunen, May 01 2014

Keywords

• nonn

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

Crossrefs

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