A211979 Numbers n formed by p 1's followed by p - 1 0's, where p is prime(n).

110, 11100, 111110000, 1111111000000, 111111111110000000000, 1111111111111000000000000, 111111111111111110000000000000000, 1111111111111111111000000000000000000, 111111111111111111111110000000000000000000000

Offset: 1

Author

Omar E. Pol, Dec 12 2012

Keywords

• nonn
• base

Examples

			For n = 3, the third prime is 5, so a(3) = 111110000 (five 1's followed by four 0's).
		

Crossrefs

Binary representation of A060286.

a(n) has A076274(n) digits.

Cf. A007088, A076274, A109241, A135650.

Programs

Mathematica

(* Technically this is in base 10 *) Table[10^(Prime[n] - 1)((10^Prime[n] - 1)/9), {n, 20}] (* Alonso del Arte, Dec 12 2012 *)
FromDigits[Join[PadRight[{},#,1],PadRight[{},#-1,0]]]&/@ Prime[ Range[ 10]] (* Harvey P. Dale, Aug 30 2015 *)