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A108333
Numbers k such that the string 97101k is prime.
1
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
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
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Jun 30 2005
STATUS
approved