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!)
A175566 a(n) = the least prime p such that (2*k + 1)*p - 2*k, k=1..n are all prime. 3
3, 3, 7, 1171, 64591, 25153801, 25153801, 4747505071 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

First primes p such that (2k+1)p-2k k=1..7 are

25153801,507079861,610817971,942962791,1040241511,1223511871,1797884761.

First primes p such that (2k+1)p-2k k=1..8 are

4747505071,10817047081,21071155561,41279978041,44304317821,

49710893611,58845917971,79925475841,96466884361,106120099471,107001847261.

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Cf. A088878 Prime numbers p such that 3p-2 is a prime.

Sequence in context: A273043 A066142 A232459 * A248859 A171543 A079073

Adjacent sequences:  A175563 A175564 A175565 * A175567 A175568 A175569

KEYWORD

nonn

AUTHOR

Zak Seidov, Jul 11 2010

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 February 24 01:16 EST 2020. Contains 332195 sequences. (Running on oeis4.)