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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A142217 Primes congruent to 20 mod 41. 2
61, 307, 389, 881, 1291, 1373, 1619, 1783, 2029, 2111, 2357, 2521, 2767, 3259, 3833, 4079, 4243, 4817, 5227, 5309, 5801, 6047, 6211, 6703, 6949, 7523, 7687, 7933, 8179, 8753, 8999, 9491, 9901, 10639, 11131, 11213, 12197, 12689, 12853, 13099, 13591, 14083 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

FORMULA

a(n) ~ 40n log n. - Charles R Greathouse IV, Jul 02 2016

MATHEMATICA

Select[Range[20, 30000, 41], PrimeQ] (* Vladimir Joseph Stephan Orlovsky, Jun 03 2011 *)

Select[Prime[Range[5000]], MemberQ[{20}, Mod[#, 41]]&] (* Vincenzo Librandi, Aug 23 2012 *)

PROG

(MAGMA) [p: p in PrimesUpTo(16000) | p mod 41 eq 20 ]; // Vincenzo Librandi, Aug 23 2012

(PARI) is(n)=isprime(n) && n%41==20 \\ Charles R Greathouse IV, Jul 02 2016

CROSSREFS

Cf. A000040, A142216.

Sequence in context: A142133 A302730 A234036 * A234029 A142923 A154601

Adjacent sequences:  A142214 A142215 A142216 * A142218 A142219 A142220

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Jul 11 2008

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 April 25 04:12 EDT 2019. Contains 322451 sequences. (Running on oeis4.)