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A109667
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Beginning with 1, a(n) = n times the digits of concatenation of a(1),a(2), ...a(n-1) read backwards.
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1, 2, 63, 14484, 2422068105, 30111613454906481726, 4390292266180212777245130215697390895347, 59487847503720962523422176966532983367477017476875634528888280148817939875308968
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| a(9) has 160 digits, a(10) has 320 digits. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 13 2008
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EXAMPLE
| a(2) = 2*1 = 2, a(3) = 3*21 = 63, a(4) = 4*3621 = 14484.
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MAPLE
| A109667 := proc(n) option remember ; if n = 1 then 1; else digs := [] ; for i from 1 to n-1 do digs := [op(digs), op(ListTools[Reverse](convert(A109667(i), base, 10))) ] ; od: n*add(op(i, digs)*10^(i-1), i=1..nops(digs)) : fi ; end: seq(A109667(n), n=1..9) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 13 2008
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CROSSREFS
| Sequence in context: A091817 A200802 A024238 * A004853 A064010 A120829
Adjacent sequences: A109664 A109665 A109666 * A109668 A109669 A109670
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KEYWORD
| base,easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Aug 03 2005
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 13 2008
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