OFFSET
1,1
COMMENTS
This is a subsequence of A216872, which has 8 in place of 9. See that sequence for more comments and a PARI/GP program.
No other terms below 5*10^6. - James G. Merickel, Dec 29 2015
PROG
(Python)
from sympy import isprime
A216873_list, n = [], 1
for i in range(2*10**6):
s = str(n)
if sum(isprime(s.count(d)) for d in '0123456789') >= 9:
A216873_list.append(i)
n *= 2 # Chai Wah Wu, Nov 12 2015
CROSSREFS
KEYWORD
nonn,base,hard,more
AUTHOR
James G. Merickel, Sep 18 2012
STATUS
approved