%I #4 Aug 15 2014 22:24:08
%S 211,227,373,503,32119,856147,2054519,131479927
%N Numbers that are palindromic right angle numbers in base 8.
%e 856147 is in the list since it is prime and is equal to 3210123 in base 8.
%o (Python)
%o from sympy import isprime
%o A246136 = []
%o for n in range(1,8):
%o ....for m in range(n-1,-1,-1):
%o ........l = ''.join([str(d) for d in range(n,m-1,-1)])
%o ........p = int(l+l[-2::-1],8)
%o ........if isprime(p):
%o ............A246136.append(p)
%o ....for m in range(n+1,8):
%o ........l = ''.join([str(d) for d in range(n,m+1)])
%o ........p = int(l+l[-2::-1],8)
%o ........if isprime(p):
%o ............A246136.append(p)
%o A246136 = sorted(A246136)
%Y Cf. A246135, A244369.
%K nonn,base,fini,full
%O 1,1
%A _Chai Wah Wu_, Aug 15 2014