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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A057914 Numbers k such that 2*5^k + 3 is prime. 1
0, 1, 2, 6, 7, 26, 35, 50, 115, 171, 204, 219, 362, 644, 1959, 4427, 5406, 8030, 10755 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

a(20) > 28465. - Jinyuan Wang, Dec 08 2019

LINKS

Table of n, a(n) for n=1..19.

MATHEMATICA

Do[ If[ PrimeQ[ 2*5^n + 3 ], Print[ n ] ], {n, 0, 2000} ]

PROG

(PARI) is(n)=ispseudoprime(2*5^n+3) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A220946 A243795 A060112 * A216037 A250547 A057249

Adjacent sequences:  A057911 A057912 A057913 * A057915 A057916 A057917

KEYWORD

nonn,more

AUTHOR

Robert G. Wilson v, Nov 16 2000

EXTENSIONS

First term 0 inserted by Georg Fischer, Aug 01 2019

a(17)-a(19) from Jinyuan Wang, Dec 08 2019

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 June 21 19:59 EDT 2021. Contains 345365 sequences. (Running on oeis4.)