The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A036386 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A036386

Number of prime powers (p^2, p^3, ...) <= 2^n.
(history; published version)

#33 by Robert C. Lyons at Thu Jan 23 19:57:09 EST 2025

STATUS

proposed

approved

#32 by Chai Wah Wu at Thu Jan 23 19:43:04 EST 2025

STATUS

editing

proposed

#31 by Chai Wah Wu at Thu Jan 23 19:42:46 EST 2025

PROG

return sum(primepi(integer_nthroot(m, j)[0]) for j in range(2, n+2)) # Chai Wah Wu, Jan 23 2025

#30 by Chai Wah Wu at Thu Jan 23 19:42:26 EST 2025

PROG

(Python)

from sympy import primepi, integer_nthroot

def A036386(n):

m = 1<<n

return sum(primepi(integer_nthroot(m, j)[0]) for j in range(2, n+2)) # Chai Wah Wu, Jan 23 2025

STATUS

approved

editing

#29 by OEIS Server at Thu Aug 19 09:50:22 EDT 2021

LINKS

Ray Chandler, <a href="/A036386/b036386_1.txt">Table of n, a(n) for n = 1..125</a> (first 112 terms from Hiroaki Yamanouchi)

#28 by Ray Chandler at Thu Aug 19 09:50:22 EDT 2021

STATUS

editing

approved

Discussion

Thu Aug 19

09:50

OEIS Server: Installed new b-file as b036386.txt.  Old b-file is now b036386_1.txt.

#27 by Ray Chandler at Thu Aug 19 09:50:08 EDT 2021

LINKS

Hiroaki Yamanouchi, Ray Chandler, <a href="/A036386/b036386_1.txt">Table of n, a(n) for n = 1..125</a> (first 112</a> terms from Hiroaki Yamanouchi)

STATUS

approved

editing

#26 by Alois P. Heinz at Wed Nov 16 05:46:02 EST 2016

STATUS

reviewed

approved

#25 by Joerg Arndt at Wed Nov 16 04:36:24 EST 2016

STATUS

proposed

reviewed

#24 by Omar E. Pol at Tue Nov 15 20:33:26 EST 2016

STATUS

editing

proposed