A164028 - OEIS

A164028

The n-th composite minus 3.

1, 3, 5, 6, 7, 9, 11, 12, 13, 15, 17, 18, 19, 21, 22, 23, 24, 25, 27, 29, 30, 31, 32, 33, 35, 36, 37, 39, 41, 42, 43, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 57, 59, 60, 61, 62, 63, 65, 66, 67, 69, 71, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 84, 85, 87, 88, 89, 90, 91, 92, 93

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..5000

FORMULA

a(n) = A002808(n) - 3.

EXAMPLE

a(1)=4-3=1. a(2)=6-3=3. a(3)=8-3=5. a(4)=6(=9-3).

MATHEMATICA

Select[Range[100], CompositeQ]-3 (* Harvey P. Dale, Oct 04 2015 *)

PROG