cp's OEIS Frontend

A246136 Numbers that are palindromic right angle numbers in base 8.

%I A246136 #6 May 22 2025 10:21:40
%S A246136 211,227,373,503,32119,856147,2054519,131479927
%N A246136 Numbers that are palindromic right angle numbers in base 8.
%e A246136 856147 is in the list since it is prime and is equal to 3210123 in base 8.
%o A246136 (Python)
%o A246136 from sympy import isprime
%o A246136 A246136 = []
%o A246136 for n in range(1,8):
%o A246136     for m in range(n-1,-1,-1):
%o A246136         l = ''.join([str(d) for d in range(n,m-1,-1)])
%o A246136         p = int(l+l[-2::-1],8)
%o A246136         if isprime(p):
%o A246136             A246136.append(p)
%o A246136     for m in range(n+1,8):
%o A246136         l = ''.join([str(d) for d in range(n,m+1)])
%o A246136         p = int(l+l[-2::-1],8)
%o A246136         if isprime(p):
%o A246136             A246136.append(p)
%o A246136 A246136 = sorted(A246136)
%Y A246136 Cf. A246135, A244369.
%K A246136 nonn,base,fini,full
%O A246136 1,1
%A A246136 _Chai Wah Wu_, Aug 15 2014