OFFSET
1,2
LINKS
Charles R Greathouse IV, Table of n, a(n) for n = 1..10000
EXAMPLE
a(1)=1 because 30*1-13=17=prime, 30*1-11=19=prime, 30*1-1=29=prime, 30*1+1=31=prime, 30*1+11=41=prime, 30*1+13=43=prime.
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Aug 09 2010
EXTENSIONS
Corrected (3472 replaced by 3772, 49776 replaced by 49791) and extended by R. J. Mathar, Aug 13 2010
STATUS
approved