The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A065313 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A065313

a(n) = Pi(n*Pi(n)).
(history; published version)

#11 by Bruno Berselli at Mon Jun 18 05:37:07 EDT 2018

STATUS

reviewed

approved

#10 by Michel Marcus at Mon Jun 18 04:05:07 EDT 2018

STATUS

proposed

reviewed

#9 by Jon E. Schoenfield at Sun Jun 17 23:14:52 EDT 2018

STATUS

editing

proposed

#8 by Jon E. Schoenfield at Sun Jun 17 23:14:50 EDT 2018

NAME

a(n) = Pi[(n*Pi(n)]).

LINKS

Harry J. Smith, <a href="/A065313/b065313.txt">Table of n, a(n) for n = 1,...,1000</a>

FORMULA

a(n) = A000720(n*A000720(n)).

PROG

(PARI) { for (n=1, 1000, if (n>1, a=primepi(n*primepi(n)), a=0); write("b065313.txt", n, " ", a) ) } [From _\\ _Harry J. Smith_, Oct 16 2009]

CROSSREFS

A000720[n*A000720(n)]

A000720, Cf. A000040, A000720.

STATUS

approved

editing

#7 by N. J. A. Sloane at Tue Oct 15 22:31:09 EDT 2013

AUTHOR

_Labos E. (labos(AT)ana.sote.hu), Elemer_, Oct 29 2001

Discussion

Tue Oct 15

22:31

OEIS Server: https://oeis.org/edit/global/2029

#6 by Russ Cox at Fri Mar 30 17:24:31 EDT 2012

PROG

(PARI) { for (n=1, 1000, if (n>1, a=primepi(n*primepi(n)), a=0); write("b065313.txt", n, " ", a) ) } [From _Harry J. Smith (hjsmithh(AT)sbcglobal.net), _, Oct 16 2009]

Discussion

Fri Mar 30

17:24

OEIS Server: https://oeis.org/edit/global/133

#5 by N. J. A. Sloane at Thu Nov 11 07:34:06 EST 2010

LINKS

Harry J. Smith, <a href="/A065313/b065313.txt">Table of n, a(n) for n=1,...,1000</a>

KEYWORD

nonn,new

nonn

#4 by N. J. A. Sloane at Tue Jun 01 03:00:00 EDT 2010

LINKS

Harry J. Smith, <a href="b065313.txt">Table of n, a(n) for n=1,...,1000</a>

PROG

(PARI) { for (n=1, 1000, if (n>1, a=primepi(n*primepi(n)), a=0); write("b065313.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 16 2009]

KEYWORD

nonn,new

nonn

#3 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006

MATHEMATICA

Table[PrimePi[w*PrimePi[w]], {w, 1, 100}].

KEYWORD

nonn,new

nonn

#2 by N. J. A. Sloane at Tue Jan 24 03:00:00 EST 2006

KEYWORD

nonn,new

nonn

AUTHOR

Labos E. (labos(AT)ana1ana.sote.hu), Oct 29 2001