A046239 Numbers whose cube is palindromic in base 8.

0, 1, 3, 9, 65, 73, 513, 4097, 4161, 32769, 262145, 262657, 2097153, 16777217, 16781313, 134217729, 1073741825, 1073774593, 8589934593, 68719476737, 68719738881

Offset

1,3

Links

Table of n, a(n) for n=1..21.

Patrick De Geest, World!Of Numbers, Palindromic cubes in bases 2 to 17.

Prog

(PARI) isok(k) = my(d=digits(k^3, 8)); Vecrev(d) == d; \\ Michel Marcus, Aug 02 2022
(Python)
from itertools import count, islice
from sympy.ntheory import is_palindromic as ispal
def agen(start=0): yield from (k for k in count(start) if ispal(k**3, 8))
print(list(islice(agen(), 12))) # Michael S. Branicky, Aug 02 2022

Crossrefs

Cf. A046240.

Sequence in context: A276535 A228776 A087673 * A093351 A018543 A026090

Adjacent sequences: A046236 A046237 A046238 * A046240 A046241 A046242

Keyword

nonn,base,more

Author

Patrick De Geest, May 15 1998

Extensions

More terms from Ryan Propper, May 30 2006

Status

approved