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A166745
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a(n) = n-th prime written as a sum of ordered digits 1,2,4,8 with a minimal number of digits.
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1
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2, 12, 14, 124, 128, 148, 188, 1288, 12488, 14888, 124888, 148888, 188888, 1288888, 12488888, 14888888, 128888888, 148888888, 1288888888, 12488888888, 1888888888, 124888888888, 128888888888, 188888888888, 1888888888888
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..25.
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MAPLE
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A166745 := proc(n) local p, d; p := ithprime(n) ; d := [] ; for e from 3 to 0 by -1 do r := floor(p/2^e) ; if r > 0 then d := [op(d), seq(2^e, i=1..r)] ; p := p mod (2^e) ; fi; end do ; add(op(p, d)*10^(p-1), p=1..nops(d)) ; end: seq(A166745(n), n=1..80) ; [From R. J. Mathar, Oct 24 2009]
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CROSSREFS
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Sequence in context: A022368 A076484 A108969 * A200183 A118516 A077103
Adjacent sequences: A166742 A166743 A166744 * A166746 A166747 A166748
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KEYWORD
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nonn,base
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AUTHOR
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Paul Curtz, Oct 21 2009
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EXTENSIONS
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Edited (but not checked) by N. J. A. Sloane, Oct 22 2009
More terms from R. J. Mathar, Oct 24 2009
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STATUS
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approved
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