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A108535
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Positions of balanced digits in the decimal expansion of Pi.
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3
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5, 155, 173, 179, 210, 236, 253, 262, 274, 275, 293, 352, 353, 359, 390, 410, 468, 603, 636, 654, 661, 674, 696, 703, 723, 732, 764, 765, 766, 767, 780, 796, 804, 822, 836, 857, 875, 885, 897, 918, 924, 961, 981, 985, 995, 996, 1015, 1059, 1200, 1234, 1246
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listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Cf. A108533 (strong digits), A108534 (weak digits). In the decimal expansion of Pi, balanced digits are much more rare than weak or strong ones.
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LINKS
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Table of n, a(n) for n=1..51.
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MATHEMATICA
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re=RealDigits[N[Pi, 2900]][[1]]; b={}; Do[r=re[[n]]; If[r==(re[[n-1]]+re[[n+1]])/2, b=Append[b, r]], {n, 2, 2899}]; A108535=b
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CROSSREFS
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Cf. A108533, A108534.
Sequence in context: A105230 A222768 A208578 * A015019 A225165 A151577
Adjacent sequences: A108532 A108533 A108534 * A108536 A108537 A108538
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov, Jun 08 2005
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STATUS
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approved
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