OFFSET
1,1
COMMENTS
a(3) found by Hans Havermann; a(4) by Phil Carmody.
EXAMPLE
An n-tuply lonely non-twin prime is a non-twin prime that is sandwiched between exactly n pairs of prime twins on both sides. a(2)=1039 because 1039 is the first non-twin to be sandwiched between exactly 2 pairs of twins on each side (1019,1021,1031,1033 and 1049,1051,1061,1063).
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Neil Fernandez, Mar 25 2002
STATUS
approved