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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 (list; graph; refs; listen; history; text; internal format)
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: A043954 A244356 A159750 * A231254 A218834 A039465

Adjacent sequences:  A108330 A108331 A108332 * A108334 A108335 A108336

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi, Jun 30 2005

STATUS

approved

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Last modified May 17 10:57 EDT 2021. Contains 343971 sequences. (Running on oeis4.)