login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 59th year, we have over 358,000 sequences, and we’ve crossed 10,300 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A107295 Numbers n such that prime(n^2) - n^2 is prime. 0
2, 4, 12, 14, 20, 42, 48, 56, 60, 88, 104, 120, 126, 134, 138, 160, 164, 182, 186, 204, 226, 254, 270, 276, 312, 316, 330, 336, 350, 382, 408, 410, 414, 422, 438, 448, 450, 480, 492, 494, 502, 522, 546, 568, 580, 596, 620, 624, 640, 650, 690, 696 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..52.

EXAMPLE

88 is in the sequence because prime(88^2) - 88^2 = prime(7744) - 7744 = 78977 - 7744 = 71233 = prime(7051).

MATHEMATICA

Select[Range[700], PrimeQ[Prime[#^2]-#^2]&] (* Harvey P. Dale, Jun 20 2015 *)

PROG

(PARI) isok(n) = isprime(prime(n^2) - n^2); \\ Michel Marcus, Oct 09 2013

CROSSREFS

Cf. A064269 (prime(n)-n is prime), A141129 (prime(n^2)-n^2).

Sequence in context: A039587 A194368 A111069 * A039564 A297064 A263466

Adjacent sequences: A107292 A107293 A107294 * A107296 A107297 A107298

KEYWORD

nonn

AUTHOR

Zak Seidov, May 20 2005

EXTENSIONS

More terms from Michel Marcus, Oct 09 2013

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 December 8 17:38 EST 2022. Contains 358698 sequences. (Running on oeis4.)