OFFSET
1,2
LINKS
Daniel Starodubtsev, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A005098(n) - 1. - Daniel Starodubtsev, Feb 10 2020
EXAMPLE
If k=99 then 4k + 5 = 401 (prime).
MATHEMATICA
Select[Range[0, 200], PrimeQ[4#+5]&] (* Harvey P. Dale, Dec 07 2013 *)
PROG
(Magma) [n: n in [0..200] | IsPrime(4*n+5)]; // Vincenzo Librandi, Nov 13 2010
(PARI) is(n)=isprime(4*n+5) \\ Charles R Greathouse IV, Aug 31 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Parthasarathy Nambi, Oct 24 2005
STATUS
approved