A338433 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A338433

Values of n for which A070939(n^3) differs from A004221(n).

1, 20, 40, 80, 101, 126, 127, 159, 160, 161, 200, 201, 202, 203, 252, 253, 254, 255, 317, 318, 319, 320, 321, 322, 399, 400, 401, 402, 403, 404, 405, 406, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511, 631, 632, 633, 634, 635, 636, 637, 638, 639, 640, 641, 642, 643, 644, 645

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Sequence gives the values of n for which the length of the binary representation of n^3 differs from ceiling(10*log_10(n)) rounded up.

The largest number not in the sequence is 158489319246111348520210137339 = floor(10^29.2). - Robert Israel, Oct 27 2020

LINKS

Jeremy Gardiner, Table of n, a(n) for n = 1..1083

Index entries for linear recurrences with constant coefficients, signature (2,-1).

MAPLE

filter:= n -> evalb(ilog2(n^3)+1 <> ceil(10*log[10](n))):

select(filter, [$1..1000]); # Robert Israel, Oct 27 2020