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A068541 Let sqrt(2)=1.d(1)d(2)d(3)...=1,0110101000001... be the expansion of sqrt(2) in base 2; sequence gives values of n such that n/2=sum(k=1,n,d(k)). 1
2, 4, 6, 8, 32, 64, 66, 70, 72, 316, 318, 326, 328, 330, 332, 336, 606, 636, 638, 654, 670, 672, 678, 680, 828, 830, 832, 834, 836, 838, 840, 842, 844, 846, 850, 880, 882, 884, 898, 900, 902, 904, 906, 908, 914, 916, 918, 928, 942, 948, 962, 964, 966, 968 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..2000

MATHEMATICA

nn=1000; Transpose[Select[With[{c=Accumulate[Rest[RealDigits[Sqrt[2], 2, nn][[1]]]]}, Thread[{c, Range[nn-1]}]], Last[#]/2==First[#]&]][[2]] (* Harvey P. Dale, Feb 27 2012 *)

CROSSREFS

Sequence in context: A092047 A057809 A135632 * A329887 A108425 A215216

Adjacent sequences:  A068538 A068539 A068540 * A068542 A068543 A068544

KEYWORD

base,easy,nonn

AUTHOR

Benoit Cloitre, Mar 22 2002

STATUS

approved

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Last modified September 28 08:33 EDT 2020. Contains 337394 sequences. (Running on oeis4.)