A144761 Integers n such that Phi(2, a(n)) = A144741(a(n)) > Phi(2, k) for 0 < k < a(n).

4, 6, 10, 12, 18, 24, 30, 36, 42, 54, 60, 78, 84, 90, 120, 150, 168, 180, 210, 240, 270, 300, 330, 390, 420, 510, 546, 570, 630, 780, 840, 990, 1050, 1170, 1260, 1320, 1470, 1650, 1680, 1890, 2100, 2310, 2730, 3150, 3360, 3570, 3990, 4290, 4620, 4830

Offset: 1

Author

Reikku Kulon, Sep 20 2008

Keywords

• easy
• nonn

Comments

Subset of A065385.

The first three terms are semiprimes and the number of factors gradually increases. All except four and ten are multiples of six.

Crossrefs

Cf. A051953, A065385, A144741, A144742