A141613 Nonprimes of the form n-(p(n+3)-p(n))/(p(n+2)-p(n+1)), where p(n)=n-th prime.

1, 4, 6, 8, 9, 10, 15, 18, 20, 22, 24, 25, 33, 34, 35, 42, 46, 48, 49, 51, 55, 57, 58, 60, 66, 69, 70, 72, 77, 80, 81, 82, 87, 88, 91, 96, 108, 111, 119, 120, 124, 129, 132, 133, 134, 135, 136, 140, 141, 142, 143, 145, 146, 156, 161, 164, 168, 170, 172, 174, 176, 188, 194

Offset

1,2

Comments

Entries are not repeated and shown in natural order.

Links

Table of n, a(n) for n=1..63.

Example

n=3: 3-(13-5)/(11-7)=1=a(1).
n=4: 4-(17-7)/(13-11)=-1 negative, discarded.
n=6: 6-(23-13)/(19-17)=1=a(1).
n=7: 7-(29-17)/(23-19)=4=a(2).
n=8: 8-(31-19)/(29-23)=6=a(3).
n=10: 10-(41-29)/(37-31)=8=a(4).

Crossrefs

Cf. A000040, A141468.

Sequence in context: A035139 A316227 A062115 * A072362 A278948 A084988

Adjacent sequences: A141610 A141611 A141612 * A141614 A141615 A141616

Keyword

nonn

Author

Juri-Stepan Gerasimov, Sep 10 2008

Extensions

Corrected and extended by R. J. Mathar, Sep 26 2008

Status

approved