The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A098391 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing all changes.

A098391

a(n) = Log2(Log2(prime(n))), where Log2 = A000523.
(history; published version)

#5 by Wesley Ivan Hurt at Sun Mar 20 23:19:30 EDT 2022

STATUS

editing

approved

#4 by Wesley Ivan Hurt at Sun Mar 20 23:19:17 EDT 2022

NAME

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

COMMENTS

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

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

CROSSREFS

Cf. A000040, A000523, A098388.

STATUS

approved

editing

#3 by Russ Cox at Fri Mar 30 18:50:45 EDT 2012

AUTHOR

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

Discussion

Fri Mar 30

18:50

OEIS Server: https://oeis.org/edit/global/246

#2 by N. J. A. Sloane at Fri Jan 09 03:00:00 EST 2009

KEYWORD

nonn,new

nonn

AUTHOR

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

#1 by N. J. A. Sloane at Wed Sep 22 03:00:00 EDT 2004

NAME

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

DATA

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))).

KEYWORD

nonn

AUTHOR

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

STATUS

approved