A138722 Concatenation of p digits 1, p digits 0 and p digits 1, where p is the n-th prime.

110011, 111000111, 111110000011111, 111111100000001111111, 111111111110000000000011111111111, 111111111111100000000000001111111111111

Offset

1,1

Links

Table of n, a(n) for n=1..6.

Mathematica

Table[FromDigits[Join[PadRight[{}, n, 1], PadRight[{}, n, 0], PadRight[{}, n, 1]]], {n, Prime[Range[7]]}] (* Harvey P. Dale, Feb 05 2017 *)

Crossrefs

Cf. A000040, A138149, A138721.

Sequence in context: A183770 A023349 A368020 * A122240 A250591 A187114

Adjacent sequences: A138719 A138720 A138721 * A138723 A138724 A138725

Keyword

base,easy,nonn

Author

Omar E. Pol, Mar 29 2008

Status

approved