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A023971 First bit in fractional part of binary expansion of 4th root of n. 1
0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = 0 if k^4 <= n <= k^4 + 2*k^3 + (3*k^2+k)/2,

= 1 if k^4 + 2*k^3 + (3*k^2+k)/2 < n < (k+1)^4. - Robert Israel, Aug 18 2014

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

[seq(floor(2*n^(1/4)) mod 2, n=1..1000)]; # Robert Israel, Aug 18 2014

MATHEMATICA

Array[ Function[ n, RealDigits[ N[ Power[ n, 1/4 ], 10 ], 2 ]// (#[ [ 1, #[ [ 2 ] ]+1 ] ])& ], 110 ]

CROSSREFS

Sequence in context: A011670 A011666 A011669 * A079260 A025457 A219463

Adjacent sequences:  A023968 A023969 A023970 * A023972 A023973 A023974

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Olivier Gérard

STATUS

approved

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Last modified March 18 22:11 EDT 2019. Contains 321305 sequences. (Running on oeis4.)