The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A132739 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A132739

Largest divisor of n not divisible by 5.
(history; published version)

#56 by Hugo Pfoertner at Mon Nov 28 08:11:03 EST 2022

STATUS

reviewed

approved

#55 by Joerg Arndt at Mon Nov 28 07:59:03 EST 2022

STATUS

proposed

reviewed

#54 by Amiram Eldar at Mon Nov 28 07:09:29 EST 2022

STATUS

editing

proposed

#53 by Amiram Eldar at Mon Nov 28 06:57:28 EST 2022

LINKS

Peter Bala, <a href="/A306367/a306367.pdf">A note on the sequence of numerators of a rational function </a>, 2019.

FORMULA

Sum_{k=1..n} a(k) ~ (5/12) * n^2. - Amiram Eldar, Nov 28 2022

STATUS

approved

editing

#52 by Alois P. Heinz at Sun Dec 05 18:48:06 EST 2021

STATUS

proposed

approved

#51 by Chai Wah Wu at Sun Dec 05 18:33:39 EST 2021

STATUS

editing

proposed

#50 by Chai Wah Wu at Sun Dec 05 18:33:30 EST 2021

PROG

return 5*a+b # Chai Wah Wu, Dec 05 2021

#49 by Chai Wah Wu at Sun Dec 05 18:33:15 EST 2021

PROG

(Python)

def A132739(n):

a, b = divmod(n, 5)

while b == 0:

a, b = divmod(a, 5)

return 5*a+b # Chai Wah Wu, Dec 05 2021

STATUS

approved

editing

#48 by Andrew Howroyd at Fri Nov 19 14:04:41 EST 2021

STATUS

reviewed

approved

#47 by Michael De Vlieger at Sun Nov 14 17:56:23 EST 2021

STATUS

proposed

reviewed