A108333 Numbers k such that the string 97101k is prime.

37, 47, 77, 91, 139, 143, 149, 163, 187, 217, 241, 259, 271, 281, 311, 341, 371, 373, 391, 401, 409, 413, 437, 463, 479, 481, 493, 509, 527, 547, 583, 601, 619, 623, 629, 643, 679, 689, 707, 709, 721, 731, 743, 769, 779, 811, 821, 847, 881, 919, 931, 973, 997, 1043, 1061, 1073, 1081, 1103

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

k=37 is in the sequence because 97101k =9710137 is prime.
k=217 is in the sequence because 97101k =97101217 is prime.

Mathematica

Select[Range[1200], PrimeQ[97101*10^IntegerLength[#]+#]&] (* Harvey P. Dale, Jan 17 2015 *)

Prog

(Magma) [ n: n in [1..1750] | IsPrime(Seqint(Intseq(n) cat [1, 0, 1, 7, 9])) ]; // Vincenzo Librandi, Feb 02 2011

Crossrefs

Cf. A108114.

Sequence in context: A349057 A244356 A159750 * A231254 A218834 A039465

Adjacent sequences: A108330 A108331 A108332 * A108334 A108335 A108336

Keyword

nonn,base

Author

Parthasarathy Nambi, Jun 30 2005

Status

approved