A103888 Numbers k such that the string 100k001 is prime.

3, 8, 12, 21, 23, 38, 42, 45, 48, 51, 54, 56, 59, 69, 72, 83, 86, 92, 93, 105, 111, 113, 131, 135, 137, 159, 161, 162, 174, 176, 183, 203, 207, 209, 210, 228, 230, 237, 245, 246, 249, 260, 264, 267, 273, 287, 300, 324, 327, 330, 336, 341, 345, 362, 386, 390, 396

Offset: 1

Author

Parthasarathy Nambi, Mar 30 2005

Keywords

• base
• nonn
• less

Examples

			93 is a term, as 10093001 is prime.
		

Crossrefs

Cf. A099678.

Programs

Mathematica

Select[Range[400],PrimeQ[FromDigits[Flatten[Prepend[IntegerDigits[1000#+1],{1,0,0}]]]]&] (* James C. McMahon, Jan 17 2024 *)

Extensions

More terms from David Wasserman, Apr 24 2008