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A098391 Log2(Log2(prime(n))), where Log2=A000523. 3
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 (list; graph; refs; listen; history; internal format)
OFFSET

1,7

COMMENTS

a(n)=A000523(A098388(n)); a(n)=A000523(A000523(A000040(n))).

CROSSREFS

Sequence in context: A138902 A036452 A102572 * A071702 A076303 A071839

Adjacent sequences:  A098388 A098389 A098390 * A098392 A098393 A098394

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 06 2004

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.