login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A098040 First occurrence of numbers p such that p = (prime(n)+ prime(n+k))/2 is prime for prime indices n=2, 3, 5... and k=1, 2, ... 0
5, 7, 11, 139, 11, 13, 449, 17, 23, 83, 23, 29, 331, 31, 67, 53, 37, 59, 41, 43, 113, 53, 509, 53, 269, 59, 83, 331, 67, 167, 71, 173, 89, 149, 83, 89, 101, 223, 311, 97, 101, 283, 101, 107, 113, 151, 137, 131, 157, 137, 127, 149, 137, 271, 137, 421, 197, 149, 257 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..60.

EXAMPLE

k=2, prime(2) + prime(2+2) = 10. 10/2 = 5

k=3, prime(2) + prime(2+3) = 14. 14/2 = 7

k=4, prime(3) + prime(3+4) = 22. 22/2 = 11

PROG

(PARI)

CROSSREFS

Sequence in context: A104387 A133761 A057659 * A263880 A082565 A086255

Adjacent sequences:  A098037 A098038 A098039 * A098041 A098042 A098043

KEYWORD

easy,nonn

AUTHOR

Cino Hilliard, Sep 10 2004

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 March 22 04:32 EDT 2019. Contains 321406 sequences. (Running on oeis4.)