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A037920 Trajectory of 8 under prime factor concatenation procedure. 0
8, 2, 2, 2, 2, 3, 37, 3, 19, 41, 3, 3, 3, 7, 13, 13, 3, 11123771, 7, 149, 317, 941, 229, 31219729, 11, 2084656339, 3, 347, 911, 118189, 11, 613, 496501723, 97, 130517, 917327, 53, 1832651281459, 3, 3, 3, 11, 139, 653, 3863, 5107 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,1
LINKS
Patrick De Geest, Home Primes
PROG
(Python)
from sympy import factorint
def iterate(n):
flst, f = [n], sorted(factorint(n, multiple=True))
while len(f) > 1:
flst += f
f = sorted(factorint(int("".join(map(str, f))), multiple=True))
return flst
print(iterate(8)) # Michael S. Branicky, Aug 02 2021
CROSSREFS
Sequence in context: A010150 A176153 A136711 * A138997 A248498 A133918
KEYWORD
fini,full,nonn,tabf,base
AUTHOR
EXTENSIONS
Edited by Charles R Greathouse IV, Apr 30 2010
STATUS
approved

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)