A023376 a(n+1) = a(n) converted to base 8 from base 4 (written in base 10).

4, 8, 16, 64, 512, 8192, 524288, 268435456, 4398046511104, 9223372036854775808, 19807040628566084398385987584, 2787593149816327892691964784081045188247552, 3291009114642412084309938365114701009965471731267159726697218048

Offset

1,1

Links

John Cerkan, Table of n, a(n) for n = 1..19

Formula

a(n) = 2^A061418(n). - John Cerkan, Nov 04 2016

Mathematica

NestList[FromDigits[IntegerDigits[#, 4], 8]&, 4, 15] (* Harvey P. Dale, Sep 24 2012 *)

Prog

(Python)
from itertools import islice
def A023376_gen(): # generator of terms
    a = 2
    while True:
        yield 1<<a
        a += a>>1
A023376_list = list(islice(A023376_gen(), 20)) # Chai Wah Wu, Sep 21 2022

Crossrefs

Cf. A061418.

Sequence in context: A102358 A038238 A230112 * A242966 A378556 A337235

Adjacent sequences: A023373 A023374 A023375 * A023377 A023378 A023379

Keyword

nonn,base

Author

David W. Wilson

Extensions

One more term (a(13)) from Harvey P. Dale, Sep 24 2012

Status

approved