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

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A126608 Smallest odd prime q such that pq+2 is prime, where p is the n-th odd prime. 6
3, 3, 3, 7, 3, 3, 3, 3, 3, 5, 3, 61, 3, 7, 7, 3, 5, 5, 7, 5, 3, 3, 3, 3, 7, 3, 7, 5, 13, 3, 7, 13, 3, 3, 5, 5, 3, 3, 3, 43, 5, 19, 5, 3, 3, 29, 5, 3, 11, 3, 3, 17, 7, 3, 19, 3, 41, 11, 31, 17, 3, 41, 7, 3, 3, 5, 3, 13, 3, 3, 19, 3, 5, 23, 3, 13, 3, 19, 3, 3, 17, 7, 3, 3, 19, 13, 3, 7, 17, 7, 3, 5, 37, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..94.

MATHEMATICA

f[n_] := Block[{p = Prime[n + 1], k = 1, q}, While[q = Prime[k + 1]; ! PrimeQ[p*q + 2], k++ ]; q]; Table[f[n], {n, 95}] (*Chandler*)

CROSSREFS

Cf. A126609.

Sequence in context: A079988 A212091 A061021 * A088195 A131757 A214834

Adjacent sequences:  A126605 A126606 A126607 * A126609 A126610 A126611

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Feb 06 2007

EXTENSIONS

Extended by Ray Chandler, Feb 07 2007

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified May 24 07:09 EDT 2013. Contains 225617 sequences.