OFFSET
1,1
COMMENTS
EXAMPLE
13 and 31 are both prime so a(1) = 13.
15 and 51 have two prime factors (3*5 and 3*17 respectively), so a(2) = 15.
PROG
(Python)
import sympy
from sympy import factorint
def rev(x):
..rev = ''
..for i in str(x):
....rev = i + rev
..return int(rev)
def RevFact(x):
..n = 1
..while n < 10**8:
....if rev(n) != n:
......if n % 10 != 0:
........if sum(list(factorint(n).values())) == x:
..........if sum(list(factorint(rev(n)).values())) == x:
............return n
..........else:
............n += 1
........else:
..........n += 1
......else:
........n += 1
....else:
......n += 1
x = 1
while x < 100:
..print(RevFact(x))
..x += 1
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Derek Orr, Feb 15 2014
EXTENSIONS
a(15)-a(21) from Giovanni Resta, Feb 23 2014
a(22)-a(27) from Max Alekseyev, Feb 07 2024
STATUS
approved