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!)
A094205 Lower bounds of twin prime pairs of the form prime(2n+1). 1
5, 11, 17, 41, 59, 137, 149, 179, 191, 197, 227, 269, 347, 419, 431, 461, 599, 617, 1019, 1031, 1229, 1289, 1319, 1427, 1607, 1697, 1787, 2027, 2081, 2087, 2141, 2309, 2381, 2549, 2591, 2711, 2789, 3299, 3329, 3359, 3371, 3389, 3539, 3581, 3929, 4001, 4019 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
EXAMPLE
For n=3, 2n+1 = 7 and prime(7) = 17 the lower bound of the (17,19) twin prime pair.
MATHEMATICA
Select[Table[Prime[2n+1], {n, 300}], PrimeQ[#+2]&] (* Harvey P. Dale, Jul 07 2017 *)
PROG
(PARI) f(n, start, step) = forstep(x=start, n, step, y=prime(x); if(isprime(y+2), print1(y", ")))
CROSSREFS
Sequence in context: A297583 A356756 A088903 * A136091 A184968 A341357
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, May 26 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 13 12:32 EDT 2024. Contains 371641 sequences. (Running on oeis4.)