A141794 Primes of the form n/(2*(prime(n+2) - prime(n+1))).

3, 3, 3, 11, 3, 17, 5, 5, 11, 7, 19, 43, 31, 11, 29, 101, 53, 67, 53, 83, 43, 59, 61, 101, 43, 223, 113, 239, 127, 71, 101, 79, 109, 53, 421, 149, 467, 157, 487, 509, 89, 181, 557, 577, 97, 617, 647, 223, 101, 79, 743

Offset

1,1

Comments

Listed in order of increasing n.

Links

Table of n, a(n) for n=1..51.

Example

For n=12, 12/2/(p(12+2)-p(12+1))=12/2/(43-31)=3=a(1).
For n=36, 36/2/(p(36+2)-p(36+1))=36/2/(163-157)=3=a(3).

Maple

for n from 1 to 3000 do p := n/2/(ithprime(n+2)-ithprime(n+1)) ; if type(p, 'integer') then if isprime(p) then printf("%d, ", p) ; fi; fi; od: # R. J. Mathar, Aug 03 2009

Crossrefs

Cf. A000040, A001223.

Sequence in context: A029616 A278822 A274487 * A129227 A252748 A346869

Adjacent sequences: A141791 A141792 A141793 * A141795 A141796 A141797

Keyword

nonn

Author

Juri-Stepan Gerasimov, Sep 15 2008

Extensions

Definition, examples and terms corrected by R. J. Mathar, Aug 03 2009

Status

approved