A098391 a(n) = Log2(Log2(prime(n))), where Log2 = A000523.

0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3

Offset

1,7

Comments

a(n) = A000523(A098388(n)).

a(n) = A000523(A000523(A000040(n))).

Links

Table of n, a(n) for n=1..105.

Crossrefs

Cf. A000040, A000523, A098388.

Sequence in context: A285481 A282622 A102572 * A071702 A225541 A355480

Adjacent sequences: A098388 A098389 A098390 * A098392 A098393 A098394

Keyword

nonn

Author

Reinhard Zumkeller, Sep 06 2004

Status

approved