1,1

Does not include every composite number; in particular, 12 is not present. If a(n) = 12, gcd(n,12) = 1, but then one of n+4 and n+8 is divisible by 3.

Table of n, a(n) for n=1..84.

Equals A122985(n) - n. Cf. A096076.

Sequence in context: A103954 A217012 A200838 * A254341 A188477 A045860

Adjacent sequences: A122981 A122982 A122983 * A122985 A122986 A122987

easy,nonn

Franklin T. Adams-Watters, Sep 22 2006

approved