OFFSET
1,1
LINKS
Chai Wah Wu, Table of n, a(n) for n = 1..66
PROG
(Python)
from __future__ import division
from sympy import isprime
A210546_list = []
for l in range(1, 20):
q = (10**l-1)//9
for i in range(l):
for p in [2, 3, 5, 7]:
r = q+(p-1)*10**i
s, t = str(r), str(r)[::-1]
if s != t and isprime(r) and isprime(int(t)):
A210546_list.append(r) # Chai Wah Wu, Aug 15 2017
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Lekraj Beedassy, Mar 22 2012
EXTENSIONS
5 more terms from Alois P. Heinz, Mar 29 2012
STATUS
approved