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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A219616 Numbers n such that 5^n + n^4 is prime. 0
2, 4, 6, 8, 24, 28, 36, 54, 92, 154, 234, 442, 1138, 2408 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..14.

MATHEMATICA

Select[Range[0, 10000, 2], PrimeQ[(5^# + #^4)] &]

PROG

(MAGMA) /* The code gives only the terms up to 442: */ [n: n in [0..1000 by 2] | IsPrime(5^n + n^4)];

(PARI) is(n)=ispseudoprime(5^n+n^4) \\ Charles R Greathouse IV, Jul 01 2013

CROSSREFS

Cf. A182359, A059802.

Sequence in context: A189153 A194393 A119260 * A067732 A222712 A117912

Adjacent sequences:  A219613 A219614 A219615 * A219617 A219618 A219619

KEYWORD

nonn,more

AUTHOR

Vincenzo Librandi, Nov 26 2012

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 October 21 12:12 EDT 2019. Contains 328299 sequences. (Running on oeis4.)