A139105 Bisection of A139101.

1, 1001, 1001010111, 1001010111010111, 1001010111010111010111, 100101011101011101011101111101, 1001010111010111010111011111010111110111, 1001010111010111010111011111010111110111010111, 1001010111010111010111011111010111110111010111011111011111, 100101011101011101011101111101011111011101011101111101111101011111, 100101011101011101011101111101011111011101011101111101111101011111011101, 1001010111010111010111011111010111110111010111011111011111010111110111010111110111

Offset: 1

Author

Omar E. Pol, Apr 08 2008

Keywords

• base
• easy
• nonn

Links

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

Crossrefs

Cf. A139101.

Programs

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

Formula

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

Extensions

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