OFFSET
0,6
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
EXAMPLE
a(0)=0 because 3^0+2^0=1+1=2 is prime,
a(5)=3 because 3^5+2^3=243+8=251 is prime.
MATHEMATICA
lm[n_]:=Module[{c=3^n, m=0}, While[!PrimeQ[c+2^m], m++]; m]; Array[lm, 90, 0] (* Harvey P. Dale, May 01 2013 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Oct 12 2006
STATUS
approved