The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A355309 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
Showing entries 1-10 | older changes

A355309

Carmichael numbers ending in 3.
(history; published version)

#18 by N. J. A. Sloane at Tue Jul 26 13:38:53 EDT 2022

STATUS

proposed

approved

#17 by Chai Wah Wu at Tue Jul 26 13:08:15 EDT 2022

STATUS

editing

proposed

Discussion

Tue Jul 26

13:09

Omar E. Pol: Thanks!

#16 by Chai Wah Wu at Tue Jul 26 13:08:08 EDT 2022

PROG

(Python)

from itertools import count, islice

from sympy import factorint

def A355309_gen(): # generator of terms

for n in count(3, 10):

f = factorint(n)

if len(f) == sum(f.values()) > 1 and not any((n-1) % (p-1) for p in f):

yield n

A355309_list = list(islice(A355309_gen(), 5)) # Chai Wah Wu, Jul 26 2022

STATUS

approved

editing

#15 by Michel Marcus at Tue Jul 26 08:00:44 EDT 2022

STATUS

reviewed

approved

#14 by Hugo Pfoertner at Tue Jul 26 07:26:57 EDT 2022

STATUS

proposed

reviewed

#13 by Amiram Eldar at Tue Jul 26 06:36:48 EDT 2022

STATUS

editing

proposed

#12 by Amiram Eldar at Tue Jul 26 06:36:45 EDT 2022

LINKS

Amiram Eldar, <a href="/A355309/b355309.txt">Table of n, a(n) for n = 1..10000</a>

STATUS

approved

editing

#11 by Michel Marcus at Tue Jul 26 06:27:06 EDT 2022

STATUS

reviewed

approved

#10 by Amiram Eldar at Tue Jul 26 06:19:59 EDT 2022

STATUS

proposed

reviewed

Discussion

Tue Jul 26

06:27

Michel Marcus: ouh la la was for the weird data

#9 by Amiram Eldar at Mon Jul 25 05:36:54 EDT 2022

STATUS

editing

proposed

Discussion

Mon Jul 25

07:09

Michel Marcus: ouh la la

07:52

Omar E. Pol: See your PARI program in A355305.