A166745 - OEIS

A166745

a(n) is the concatenation, in ascending order, of the set of digits 1,2,4,8 whose sum equals the n-th prime using a minimal number of digits.

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

1,1

LINKS

Table of n, a(n) for n=1..25.

MAPLE

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) ; # R. J. Mathar, Oct 24 2009

CROSSREFS

Sequence in context: A108969 A269130 A265485 * A352504 A262094 A200183

Adjacent sequences: A166742 A166743 A166744 * A166746 A166747 A166748

KEYWORD

nonn,base

AUTHOR

Paul Curtz, Oct 21 2009

EXTENSIONS

Edited (but not checked) by N. J. A. Sloane, Oct 22 2009

More terms from R. J. Mathar, Oct 24 2009

Name edited by Jon E. Schoenfield, May 09 2019

STATUS

approved