OFFSET
1,3
COMMENTS
EXAMPLE
2 belongs in the sequence because the smallest d satisfying "n, n+d, n+2d are all prime" is 2. 4 does not belong, despite there existing triples {n, n+4, n+8} that are all prime--because a difference of 4 does not allow a new length of progression, i.e. there is no prime progression {n, n+4, n+8, n+12}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jon Wild, Jan 26 2006
STATUS
approved