OFFSET
1,3
COMMENTS
Does every positive integer occur?
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..1000
EXAMPLE
gcd(16,6) = 2, gcd(15,5) = 5, gcd(14,4) = 2, gcd(13,3) = 1, so a(7) = 4.
MATHEMATICA
Table[m = 1; While[GCD[Prime[n] - m, n - m] != 1, m++]; m, {n, 1, 140}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Jul 27 2012
STATUS
approved