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Search: id:A067556
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| A067556 |
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Terms in the decimal expansion of 1/(7*2^n) before the block of decimals 142857 (the period of 1/7) appears. |
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+0
4
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| 7, 357, 17857, 892857, 44642857, 2232, 111607, 5580357, 279017857, 13950892857, 697544642857, 34877232, 1743861607, 87193080357, 4359654017857, 217982700892857, 10899135044642857, 544956752232, 27247837611607
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OFFSET
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1,1
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COMMENT
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Example : 1/(7*2^5) = 0.0044642857(142857...) where 142857 is the period of 1/7, hence a(5)=44642857.
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FORMULA
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a(n)=(1/7)*(5^n*10^(n mod 6)-1)
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PROGRAM
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(PARI) a(n)=(1/7)*(5^n*10^(n%6)-1)
(PARI) a(n)=if(n<0, 0, s=1; while(frac(10^s/7/2^n-1/7)>0, s++); floor(10^s/7/2^n))
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CROSSREFS
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Sequence in context: A109493 A015479 A142669 this_sequence A082098 A057634 A145181
Adjacent sequences: A067553 A067554 A067555 this_sequence A067557 A067558 A067559
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KEYWORD
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nonn,base
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 29 2002; revised Dec 11, 2004
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