OFFSET
1,1
COMMENTS
for n=1 2 is the least twin of 2,3
for n=2 3 is the least twin of 3,5 and 5,7
for n=3 5 is the least twin of 5,7, 11,13, and 17,19
for n=4 11 is the least twin of 11,13, 41,43, 71,73, and 101,103
a(n) + d(n)*k is prime for k=0 to n-1, for d(n) = 0,2,6,30,420,420,16590,1517670,...
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Pierre CAMI, Apr 02 2011
STATUS
approved