login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A025006 a(1) = 7; a(n+1) = a(n)-th nonprime, where nonprimes begin at 1. 0
7, 12, 20, 30, 44, 62, 85, 115, 150, 194, 247, 310, 386, 477, 583, 710, 858, 1030, 1232, 1464, 1734, 2043, 2400, 2809, 3270, 3798, 4396, 5073, 5838, 6702, 7675, 8768, 9997, 11370, 12905, 14615, 16528, 18658, 21024, 23655, 26570, 29798, 33372, 37324, 41685 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

MATHEMATICA

With[{np=Select[Range[100000], !PrimeQ[#]&]}, NestList[np[[#]]&, 7, 50]] (* Harvey P. Dale, Apr 06 2018 *)

CROSSREFS

Sequence in context: A271988 A093330 A071247 * A189321 A273072 A273147

Adjacent sequences:  A025003 A025004 A025005 * A025007 A025008 A025009

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 3 10:25 EDT 2022. Contains 355050 sequences. (Running on oeis4.)