login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A248547 Numbers n such that 75^n+2 is prime. 0
0, 12, 28, 53, 65, 504, 1967, 6915 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Dedicated to N. J. A. Sloane for his 75th birthday!

Next term, if it exists, is greater than 10000.

LINKS

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

MATHEMATICA

Select[Range[0, 1000], PrimeQ[75^# + 2] &]

PROG

(MAGMA) [n: n in [0..200] | IsPrime(75^n+2)]; // Vincenzo Librandi, Oct 08 2014

(PARI) is(n)=ispseudoprime(75^n+2) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Cf. A051783, A087885, A090649, A109076, A138048, A113480, A138049, A138050.

Sequence in context: A107707 A183053 A126195 * A164533 A034319 A097427

Adjacent sequences:  A248544 A248545 A248546 * A248548 A248549 A248550

KEYWORD

nonn,more

AUTHOR

Vaclav Kotesovec, Oct 08 2014

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 January 17 18:14 EST 2020. Contains 330987 sequences. (Running on oeis4.)