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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
Franklin T. Adams-Watters, Sep 22 2006