OFFSET
1,1
COMMENTS
Supersequence of A063908.
Left edge of the triangle in A065305. - Reinhard Zumkeller, Jan 30 2012
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
FORMULA
Half of p + 3, where p is a prime greater than 2.
MATHEMATICA
(Prime[Range[2, 100]]+3)/2 (* Vladimir Joseph Stephan Orlovsky, Feb 08 2010 *)
Select[Range[200], PrimeQ[2#-3]&] (* Harvey P. Dale, Mar 05 2022 *)
PROG
(Magma) [ n: n in [1..200] | IsPrime(2*n-3) ]; // Vincenzo Librandi, Dec 26 2010
(PARI) is(n)=isprime(2*n-3) \\ Charles R Greathouse IV, Feb 17 2017
(Sage) [n for n in (1..200) if is_prime(2*n-3) ] # G. C. Greubel, May 21 2019
(GAP) Filtered([1..200], k-> IsPrime(2*k-3) ) # 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), A101448 (k=11), A153081 (k=13), A089559 (k=15), A173059 (k=17), A153143 (k=19).
KEYWORD
easy,nonn
AUTHOR
Douglas Winston (douglas.winston(AT)srupc.com), Sep 14 2004
STATUS
approved