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1, 1001, 1001010111, 1001010111010111, 1001010111010111010111, 100101011101011101011101111101, 1001010111010111010111011111010111110111, 1001010111010111010111011111010111110111010111, 1001010111010111010111011111010111110111010111011111011111, 100101011101011101011101111101011111011101011101111101111101011111, 100101011101011101011101111101011111011101011101111101111101011111011101, 1001010111010111010111011111010111110111010111011111011111010111110111010111110111
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..12.
Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.
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FORMULA
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a(n) = A139101(2n-1). - R. J. Mathar, Apr 25 2008
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MAPLE
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A139101 := proc(n) option remember ; local a, p; if n = 1 then RETURN(1); else a := 10*A139101(n-1) ; for p from ithprime(n-1)+1 to ithprime(n)-1 do a := 10*a+1 ; od: fi ; RETURN(a) ; end: A139105 := proc(n) A139101(2*n-1) ; end: seq(A139105(n), n=1..12) ; # R. J. Mathar, Apr 25 2008
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CROSSREFS
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Cf. A139101.
Sequence in context: A143906 A215593 A204575 * A262596 A213316 A169828
Adjacent sequences: A139102 A139103 A139104 * A139106 A139107 A139108
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KEYWORD
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base,easy,nonn
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AUTHOR
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Omar E. Pol, Apr 08 2008
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EXTENSIONS
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More terms from R. J. Mathar, Apr 25 2008
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STATUS
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approved
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