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A139105 Bisection of A139101. 1
1, 1001, 1001010111, 1001010111010111, 1001010111010111010111, 100101011101011101011101111101, 1001010111010111010111011111010111110111, 1001010111010111010111011111010111110111010111, 1001010111010111010111011111010111110111010111011111011111, 100101011101011101011101111101011111011101011101111101111101011111, 100101011101011101011101111101011111011101011101111101111101011111011101, 1001010111010111010111011111010111110111010111011111011111010111110111010111110111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

Omar E. Pol, Determinacion geometrica de los numeros primos y perfectos.

FORMULA

a(n) = A139101(2n-1). - R. J. Mathar, Apr 25 2008

MAPLE

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

CROSSREFS

Cf. A139101.

Sequence in context: A143906 A215593 A204575 * A262596 A213316 A169828

Adjacent sequences:  A139102 A139103 A139104 * A139106 A139107 A139108

KEYWORD

base,easy,nonn

AUTHOR

Omar E. Pol, Apr 08 2008

EXTENSIONS

More terms from R. J. Mathar, Apr 25 2008

STATUS

approved

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Last modified August 11 00:55 EDT 2022. Contains 356046 sequences. (Running on oeis4.)