OFFSET
1,1
COMMENTS
From Bernard Schott, Jan 30 2022: (Start)
If k is a term, then u = 3*k is a term of A057708, because 8^k = 2^(3k).
If k is an even term, then t = 3*k/2 is a term of A350441, because 8^k = 4^(3k/2). First examples: k = 8, 50, 552, 668, 4230, 34310, ... and corresponding t = 12, 75, 828, 1002, 6345, 51465, ... (End)
MATHEMATICA
Select[Range[2200], PrimeQ[IntegerReverse[8^#]] &] (* Amiram Eldar, Dec 31 2021 *)
PROG
(PARI) isok(m) = isprime(fromdigits(Vecrev(digits(8^m))))
(Python)
from sympy import isprime
m = 8
for n in range (1, 2000):
if isprime(int(str(m)[::-1])):
print(n)
m *= 8
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Mohammed Yaseen, Dec 31 2021
EXTENSIONS
a(10)-a(12) from Amiram Eldar, Dec 31 2021
STATUS
approved