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Search: id:A147818
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| A147818 |
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Period 4: repeat 5,9,9,5. |
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+0
1
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| 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5, 9, 9, 5, 5
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Last digit of the number whose binary representation is the concatenation of n 1's, 2n-1 digits 0 and n 1's.
a(n) is the final digit of A147539(n).
Terms of the simple continued fraction of 838/[5*(197669)-2059]. decimal expansion of 545/909. [From Paolo P. Lava (ppl(AT)spl.at), Aug 05 2009]
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FORMULA
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a(n)=(1/6)*{7*(n mod 4)+13*[(n+1) mod 4]+7*[(n+2) mod 4]+[(n+3) mod 4]}, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Nov 17 2008]
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MAPLE
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A010879 := proc(n) n mod 10 ; end: A147539 := proc(n) 2^n-1+2^(4*n-1)-2^(3*n-1) ; end: A147818 := proc(n) A010879(A147539(n)) ; end: for n from 1 to 120 do printf("%d, ", A147818(n)) ; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 22 2009]
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CROSSREFS
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Cf. A138120, A147539.
Sequence in context: A063623 A085566 A076390 this_sequence A147777 A086731 A147776
Adjacent sequences: A147815 A147816 A147817 this_sequence A147819 A147820 A147821
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KEYWORD
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base,easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Nov 14 2008, Jan 25 2009
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 22 2009
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