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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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3
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7, 357, 17857, 892857, 44642857, 2232, 111607, 5580357, 279017857, 13950892857, 697544642857, 34877232, 1743861607, 87193080357, 4359654017857, 217982700892857, 10899135044642857, 544956752232, 27247837611607
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 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
| a(n)=(1/7)*(5^n*10^(n mod 6)-1)
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PROG
| (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
| Sequence in context: A015479 A142669 A185062 * A082098 A057634 A203706
Adjacent sequences: A067553 A067554 A067555 * A067557 A067558 A067559
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KEYWORD
| nonn,base
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 29 2002; revised Dec 11, 2004
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