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Revision History for A353960

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Showing entries 1-10 | older changes
a(1)=1. Thereafter, if a(n) has occurred k (>1) times in a(j), 1 <= j <= n then a(n+1) = k*a(n). If a(n) is a first occurrence, a(n+1) = A078709(a(n)).
(history; published version)
#32 by Michel Marcus at Sun Jun 05 01:11:57 EDT 2022
STATUS

reviewed

approved

#31 by Joerg Arndt at Sun Jun 05 01:08:27 EDT 2022
STATUS

proposed

reviewed

#30 by Chai Wah Wu at Sat Jun 04 19:46:53 EDT 2022
STATUS

editing

proposed

#29 by Chai Wah Wu at Sat Jun 04 19:46:47 EDT 2022
PROG

(Python)

from itertools import islice

from sympy import divisor_count

def A353960_gen(): # generator of terms

adict, a = {}, 1

yield a

while True:

if a in adict:

adict[a] += 1

a *= adict[a]

else:

adict[a] = 1

a //= divisor_count(a)

yield a

A353960_list = list(islice(A353960_gen(), 30)) # Chai Wah Wu, Jun 04 2022

STATUS

approved

editing

#28 by N. J. A. Sloane at Sat Jun 04 13:22:53 EDT 2022
STATUS

proposed

approved

#27 by Michel Marcus at Sat Jun 04 12:40:45 EDT 2022
STATUS

editing

proposed

#26 by Michel Marcus at Sat Jun 04 12:40:28 EDT 2022
COMMENTS

Conjecture: C(m) = A125057(m) + k, where k is the number of divisors d of m such that 1 < d <= C(m/d). The cardinality of m due to occurrences of novel terms is A125057(m), whereas the cardinality due to repeat terms is is counted by k, and all of the latter terms occur prior to any of the former. (Note comments in A125057, A126888, A125056, concerning definitions of those sequences.)

STATUS

approved

editing

Discussion
Sat Jun 04
12:40
Michel Marcus: is is
#25 by Michael De Vlieger at Thu Jun 02 14:49:52 EDT 2022
STATUS

reviewed

approved

#24 by Michael De Vlieger at Fri May 27 16:38:19 EDT 2022
STATUS

proposed

reviewed

#23 by Michel Marcus at Mon May 16 07:07:34 EDT 2022
STATUS

editing

proposed