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Exponent of highest power of 2 dividing Euler Phi of primorials.
Table of n, a(n) for n=0..66.
n=6, 6th primorial is 30030, Phi(30030)=5760=128.9.5, so a(6)=7, exponent of 128.
Cf. A007814, A000010, A002110.
Sequence in context: A022440 A088130 A046840 * A020486 A091428 A047499
Adjacent sequences: A057770 A057771 A057772 * A057774 A057775 A057776
Labos Elemer, Nov 02 2000