OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
FORMULA
EXAMPLE
73 is in the sequence because 37+4=41 prime.
331 is in the sequence because 133+4=137 prime.
3457 is in the sequence because 7543+4=7547 prime.
MATHEMATICA
Select[Prime[Range[700]], PrimeQ[FromDigits[Reverse[IntegerDigits[#]]]+ 4]&] (* Harvey P. Dale, May 21 2012 *)
Select[Prime[Range[700]], PrimeQ[IntegerReverse[#]+4]&] (* Harvey P. Dale, Mar 16 2023 *)
PROG
(Magma) [p: p in PrimesUpTo(6000) | IsPrime(q+4) where q is Seqint(Reverse(Intseq(p)))]; // Vincenzo Librandi, Sep 15 2013
CROSSREFS
KEYWORD
nonn,base,less
AUTHOR
Vincenzo Librandi, Oct 15 2009
EXTENSIONS
Keyword:base added, 3163 inserted, sequence extended by R. J. Mathar, Oct 16 2009
STATUS
approved