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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A207838 Numbers n such that 5n^4 + 1 is prime. 2
6, 12, 114, 120, 324, 336, 390, 420, 498, 504, 540, 672, 756, 768, 840, 852, 876, 1014, 1062, 1092, 1122, 1170, 1188, 1248, 1266, 1314, 1344, 1398, 1440, 1470, 1524, 1758, 1770, 1818, 1860, 1968, 2028, 2046, 2088, 2184, 2190, 2232, 2262, 2268, 2304, 2382, 2430 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are multiples of 6.

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..3000

MATHEMATICA

Select[Range[2440], PrimeQ[5 #^4 + 1] &] (* by definition *)

PROG

(PARI) for(n=1, 406, r=6480*n^4+1; if(isprime(r), print1(6*n", ")));

(MAGMA) [6*n: n in [1..406] | IsPrime(6480*n^4+1)];

CROSSREFS

Cf. A207837 (primes of the form 5n^4+1).

Cf. A005097, A111051, A115104.

Sequence in context: A191462 A080450 A144760 * A191662 A095388 A038515

Adjacent sequences:  A207835 A207836 A207837 * A207839 A207840 A207841

KEYWORD

nonn,easy

AUTHOR

Bruno Berselli, Feb 21 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 November 12 09:25 EST 2019. Contains 329054 sequences. (Running on oeis4.)