This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A118599 #12 Jun 15 2024 09:26:09 %S A118599 0,1,2,3,4,5,6,7,11,22,33,44,55,66,77,101,111,121,131,141,151,161,171, %T A118599 202,212,222,232,242,252,262,272,303,313,323,333,343,353,363,373,404, %U A118599 414,424,434,444,454,464,474,505,515,525,535,545,555,565,575,606,616 %N A118599 Palindromes in base 8 (written in base 8). %t A118599 (* get NextPalindrome from A029965 *) Select[NestList[NextPalindrome, 0, 70], Max@IntegerDigits@# < 8 &] (* _Robert G. Wilson v_, May 09 2006 *) %o A118599 (Python) %o A118599 def A118599(n): %o A118599 if n == 1: return 0 %o A118599 y = (x:=1<<(m:=n.bit_length()-2)-m%3)<<3 %o A118599 return int((s:=oct(n-x)[2:])+s[-2::-1] if n<x+y else (s:=oct(n-y)[2:])+s[::-1]) # _Chai Wah Wu_, Jun 14 2024 %Y A118599 Cf. A029803, A057148, A118594, A118595, A118596, A118597, A118598, A118599, A118600, A002113. %K A118599 nonn,base %O A118599 1,3 %A A118599 _Martin Renner_, May 08 2006 %E A118599 More terms from _Robert G. Wilson v_, May 09 2006