OFFSET
1,3
COMMENTS
2 is the smallest single-digit prime and 11 is the smallest two-digit prime.
LINKS
Shawn A. Broyles, Table of n, a(n) for n = 1..1000
EXAMPLE
If n=1, then 2*1 + 11 = 13 (prime).
If n=49, then 2*49 + 11 = 109 (prime).
If n=69, then 2*69 + 11 = 149 (prime).
MAPLE
select(k-> isprime(11+2*k), [$0..200])[]; # Alois P. Heinz, Jun 02 2022
MATHEMATICA
Select[Range[0, 200], PrimeQ[2# + 11] &] (* Stefan Steinerberger, Feb 28 2006 *)
PROG
(Magma) [n: n in [0..200] | IsPrime(2*n+11)] // Vincenzo Librandi, Nov 17 2010
(PARI) is(n)=isprime(2*n+11) \\ Charles R Greathouse IV, Apr 29 2015
(Sage) [n for n in (0..200) if is_prime(2*n+11) ] # G. C. Greubel, May 21 2019
(GAP) Filtered([0..200], k-> IsPrime(2*k+11) ) # G. C. Greubel, May 21 2019
CROSSREFS
Numbers n such that 2n+k is prime: A005097 (k=1), A067076 (k=3), A089038 (k=5), A105760 (k=7), A155722 (k=9), this seq (k=11), A153081 (k=13), A089559 (k=15), A173059 (k=17), A153143 (k=19).
KEYWORD
easy,nonn
AUTHOR
Parthasarathy Nambi, Jan 24 2005
EXTENSIONS
More terms from Stefan Steinerberger, Feb 28 2006
Definition clarified by Zak Seidov, Jul 11 2014
STATUS
approved