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A103888
Numbers k such that the string 100k001 is prime.
0
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
1,1
EXAMPLE
93 is a term, as 10093001 is prime.
MATHEMATICA
Select[Range[400], PrimeQ[FromDigits[Flatten[Prepend[IntegerDigits[1000#+1], {1, 0, 0}]]]]&] (* James C. McMahon, Jan 17 2024 *)
CROSSREFS
Cf. A099678.
Sequence in context: A287081 A352814 A294482 * A014255 A350221 A370755
KEYWORD
base,nonn,less
AUTHOR
Parthasarathy Nambi, Mar 30 2005
EXTENSIONS
More terms from David Wasserman, Apr 24 2008
STATUS
approved