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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A115349 Numbers k such that (4*k^5 + 1) is prime. 2
1, 12, 15, 19, 27, 40, 49, 57, 60, 90, 93, 102, 132, 133, 147, 148, 153, 177, 190, 219, 240, 249, 258, 265, 274, 277, 280, 294, 313, 324, 337, 342, 363, 382, 394, 435, 448, 453, 462, 483, 489, 502, 522, 534, 538, 550, 580, 588, 609, 613, 634, 643, 648, 649 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

EXAMPLE

If k=90 then (4*90^5 + 1) = 23619600001, which is prime.

If k=133 then (4*133^5 + 1) = 166463183573, which is prime.

MAPLE

select(t -> isprime(4*t^5+1), [$1..1000]); # Robert Israel, Jun 19 2018

MATHEMATICA

Do[If[PrimeQ[4*n^5 + 1], Print[n]], {n, 0, 1000}]

PROG

(Magma) [n: n in [0..1500] | IsPrime(4*n^5 + 1)]; // Vincenzo Librandi, Jan 31 2011

(PARI) is(n)=isprime((4*n^5+1)) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Cf. A115104, A001912.

Sequence in context: A329731 A350563 A120169 * A196224 A163657 A117815

Adjacent sequences:  A115346 A115347 A115348 * A115350 A115351 A115352

KEYWORD

nonn,easy

AUTHOR

Parthasarathy Nambi, Mar 07 2006

EXTENSIONS

More terms from Craig Baribault (csb166(AT)psu.edu), Mar 14 2006 and Jessica M. Cornwall (jmc510(AT)psu.edu), Mar 22 2006

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 October 2 22:58 EDT 2022. Contains 357230 sequences. (Running on oeis4.)