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

211, 227, 373, 503, 32119, 856147, 2054519, 131479927

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Example

856147 is in the list since it is prime and is equal to 3210123 in base 8.

Prog

(Python)
from sympy import isprime
A246136 = []
for n in range(1, 8):
....for m in range(n-1, -1, -1):
........l = ''.join([str(d) for d in range(n, m-1, -1)])
........p = int(l+l[-2::-1], 8)
........if isprime(p):
............A246136.append(p)
....for m in range(n+1, 8):
........l = ''.join([str(d) for d in range(n, m+1)])
........p = int(l+l[-2::-1], 8)
........if isprime(p):
............A246136.append(p)
A246136 = sorted(A246136)

Crossrefs

Cf. A246135, A244369.

Sequence in context: A133959 A133960 A031931 * A087833 A240918 A346948

Adjacent sequences: A246133 A246134 A246135 * A246137 A246138 A246139

Keyword

nonn,base,fini,full

Author

Chai Wah Wu, Aug 15 2014

Status

approved