OFFSET
1,1
COMMENTS
The prime numbers in this sequence are of the form (18i-5) with i=(level(n)+1)/2, level(n) defined in A117563.
LINKS
Remi Eismann, Table of n, a(n) for n=1..10000
EXAMPLE
a(1)=13 because of 17=13+mod(13;9) and 17-13=4.
18*1-5=13, level=1
a(2)=103 because of 107=103+mod(103;9) and 107-103=4
18*((11+1)/2)-5=103, level=11
CROSSREFS
KEYWORD
nonn
AUTHOR
Rémi Eismann, Jun 01 2006, May 04 2007
STATUS
approved