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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A098817 Least k such that k*(Mersenne_prime(n)^2) -1 and k*(Mersenne_prime(n)^2) +1 are twin primes. 0
2, 18, 72, 780, 228, 852, 798, 1080, 4020, 25800, 6012, 713502, 332880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

2*((2^2-1)^2)-1=17, 2*((2^2-1)^2)+1=19; 17 and 19 are twin primes so a(1)=2

CROSSREFS

Sequence in context: A120361 A120358 A152887 * A197093 A034473 A024171

Adjacent sequences:  A098814 A098815 A098816 * A098818 A098819 A098820

KEYWORD

more,nonn

AUTHOR

Pierre CAMI, Oct 08 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 May 25 15:24 EDT 2019. Contains 323572 sequences. (Running on oeis4.)