login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A029976 Palindromic primes in base 8. 11
2, 3, 5, 7, 73, 89, 97, 113, 211, 227, 251, 349, 373, 463, 479, 487, 503, 4289, 4481, 4937, 5393, 5521, 5657, 5849, 6761, 7537, 7993, 12547, 12611, 12739, 13003, 13259, 13331, 13523, 14107, 14563, 14627, 14891, 15083, 15667, 15731, 15859 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..15000

Patrick De Geest, World!Of Palindromic Primes

MATHEMATICA

palQ[n_, b_:10] := Module[{idn = IntegerDigits[n, b]}, idn == Reverse[idn]]; Select[Prime[Range[2000]], palQ[#, 8] &] (* Harvey P. Dale, Dec 23 2013 *)

PROG

(Python)

from itertools import chain

from sympy import isprime

from gmpy2 import digits

A029976 = sorted((n for n in chain((int(digits(x, 8)+digits(x, 8)[::-1], 8) for x in range(1, 8**6)), (int(digits(x, 8)+digits(x, 8)[-2::-1], 8) for x in range(1, 8**6))) if isprime(n)))

# Chai Wah Wu, Aug 16 2014

(PARI) forprime(p=2, 10^4, my(d=digits(p, 8)); if(d==Vecrev(d), print1(p, ", "))); \\ Joerg Arndt, Aug 17 2014

CROSSREFS

Cf. A006341.

Sequence in context: A241723 A090717 A090715 * A074310 A264576 A070275

Adjacent sequences:  A029973 A029974 A029975 * A029977 A029978 A029979

KEYWORD

nonn,base

AUTHOR

Patrick De Geest

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 9 08:41 EST 2021. Contains 349627 sequences. (Running on oeis4.)