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Search: id:A162473
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| A162473 |
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Write n in binary n times and concatenate (see example). a(n) is the decimal equivalent. |
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+0
2
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| 1, 10, 63, 2340, 23405, 224694, 2097151, 2290649224, 41231686041, 733007751850, 12900936432571, 225179981368524, 3903119677054429, 67253754435399406, 1152921504606846975, 623961713349486025654800
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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The binary representations of the first few terms are 1, 1010, 111111, 100100100100, 101101101101101
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MAPLE
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A070939 := proc(n) max(1, ilog2(n)+1) ; end: A162473 := proc(n) local bid, a062383; bid := A070939(n) ; a062383 := 2^bid ; n*(a062383^n-1)/(a062383-1) ; end: seq(A162473(n), n=1..30) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 06 2009]
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CROSSREFS
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A162472
Sequence in context: A075755 A046638 A101467 this_sequence A138661 A036426 A055855
Adjacent sequences: A162470 A162471 A162472 this_sequence A162474 A162475 A162476
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KEYWORD
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base,nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jul 04 2009
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 06 2009
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