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The ratio of n/c(n) (where c(n)=A004001) reaches a maximum of 2.0 when n is a power of 2. When n=6 the ratio has a relative minimum of 1.5, so a(2) = 6.
Table of n, a(n) for n=1..25.
Sequence in context: A287425 A088052 A045693 * A319910 A319636 A001867
Adjacent sequences: A051281 A051282 A051283 * A051285 A051286 A051287