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A242349 Largest power of 2 <= n^2. 0
1, 4, 8, 16, 16, 32, 32, 64, 64, 64, 64, 128, 128, 128, 128, 256, 256, 256, 256, 256, 256, 256, 512, 512, 512, 512, 512, 512, 512, 512, 512, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 1024, 2048, 2048, 2048, 2048, 2048, 2048 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The first values of n that produce powers of 4 are precisely the powers of 2.
LINKS
EXAMPLE
a(3) = 8 because 3^2 = 9 and the largest power of 2 <= 9 is 8.
PROG
(PARI) a(n)=2^(#binary(n^2)-1) \\ Charles R Greathouse IV, May 11 2014
CROSSREFS
Sequence in context: A312764 A166634 A189007 * A309521 A072603 A123535
KEYWORD
nonn,easy
AUTHOR
J. Lowell, May 11 2014
STATUS
approved

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Last modified June 20 01:37 EDT 2024. Contains 373510 sequences. (Running on oeis4.)