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Search: id:A065760
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| A065760 |
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Concatenation of increasing number of alternating digits in base 2, starting with 1. |
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+0
3
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| 1, 4, 39, 624, 19999, 1279936, 163831935, 41940975360, 21473779384831, 21989150090066944, 45033779384457103359, 184458360358736295358464, 1511082888058767731576545279, 24757582037954850514150117851136
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,50
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EXAMPLE
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a(5) = 19999 is formed by appending 1 five times (11111) to a(4) in base 2: 100111000011111.
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PROGRAM
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(PARI) baseI(x, b)= { local(d, e=0, f=1); while (x>0, d=x-10*(x\10); x\=10; e+=d*f; f*=b); return(e) } { c=1; for (n=1, 50, if (n==1, a=1; b=1, c=c*10 + 1; if (n%2, d=c, d=0); b=b*10^n + d; a=baseI(b, 2)); write("b065760.txt", n, " ", a) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Oct 30 2009]
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CROSSREFS
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Decimal version of A065447. Cf. A065761.
Sequence in context: A068187 A024055 A066399 this_sequence A132612 A129463 A136653
Adjacent sequences: A065757 A065758 A065759 this_sequence A065761 A065762 A065763
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KEYWORD
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base,easy,nonn,new
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AUTHOR
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Lior Manor (lior.manor(AT)gmail.com) Nov 18 2001
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