login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A171136 A171135(n) + 2n. 2
4, 6, 9, 10, 13, 14, 17, 19, 21, 22, 25, 26, 29, 31, 33, 34, 37, 38, 41, 43, 47, 46, 49, 51, 53, 55, 57, 58, 61, 62, 65, 67, 69, 71, 73, 74, 77, 79, 83, 82, 85, 86, 89, 91, 93, 94, 97, 101, 101, 103, 107, 106, 109, 111, 113, 115, 119, 118, 121, 122, 127, 127, 129, 131 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

By definition of A171135: a(n) is prime or semiprime: A010051(a(n))+A064911(a(n))=1; A001222(a(n))<=2.

LINKS

Table of n, a(n) for n=1..64.

PROG

(PARI) a(n)=forprime(p=2, , if(bigomega(p+2*n)<3, return(p+2*n))) \\ Charles R Greathouse IV, Oct 21 2014

CROSSREFS

Sequence in context: A120329 A182800 A123249 * A189167 A283794 A287003

Adjacent sequences:  A171133 A171134 A171135 * A171137 A171138 A171139

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Dec 04 2009

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 17 07:39 EDT 2021. Contains 348048 sequences. (Running on oeis4.)