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A102340 Numbers k such that k3333 is prime. 1
2, 10, 14, 31, 32, 34, 35, 49, 52, 73, 74, 79, 80, 92, 95, 97, 113, 116, 118, 125, 127, 128, 134, 136, 139, 142, 148, 149, 155, 160, 169, 172, 178, 185, 196, 205, 211, 217, 224, 227, 238, 245, 251, 260, 262, 263, 265, 272, 281, 283, 284, 287, 296, 298, 304, 305, 311, 322, 323, 325, 326, 335, 343 (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=2 is in the sequence because  k3333 = 23333 is prime.

k=73 is in the sequence because k3333 = 733333 is prime.

k=125 is in the sequence because k3333 = 1253333 is prime.

MATHEMATICA

Select[Range[500], PrimeQ[FromDigits[Join[IntegerDigits[#], {3, 3, 3, 3}]]]&] (* Harvey P. Dale, Jun 17 2014 *)

PROG

(MAGMA) [ n: n in [1..700] | IsPrime(Seqint([3, 3, 3, 3] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 04 2011

CROSSREFS

Cf. A101472.

Sequence in context: A217191 A190043 A217681 * A293931 A047043 A244268

Adjacent sequences:  A102337 A102338 A102339 * A102341 A102342 A102343

KEYWORD

nonn,base

AUTHOR

Parthasarathy Nambi, Feb 20 2005

STATUS

approved

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Last modified January 19 21:47 EST 2020. Contains 331066 sequences. (Running on oeis4.)