A173073 (n-th nonnegative nonprime) minus (n-1).

0, 0, 2, 3, 4, 4, 4, 5, 6, 6, 6, 7, 8, 8, 8, 9, 9, 9, 9, 9, 10, 11, 11, 11, 11, 11, 12, 12, 12, 13, 14, 14, 14, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 17, 18, 18, 18, 18, 18, 19, 19, 19, 20, 21, 21, 21, 21, 21, 22, 22, 22, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 25, 25, 25

Offset: 1

Author

Juri-Stepan Gerasimov, Feb 09 2010

Keywords

• nonn

Comments

Zero together with (natural nonprimes minus n).

Crossrefs

Cf. A001477, A073425, A141468.

Formula

a(n)=A141468(n)-A001477(n-1). [corrected R. J. Mathar, Apr 25 2010]

Extensions

Formula index corrected by R. J. Mathar, Apr 24 2010