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A102373 Numbers k such that k33333 is prime. 0
7, 11, 26, 28, 32, 34, 37, 44, 49, 56, 62, 64, 70, 85, 95, 103, 106, 110, 119, 121, 125, 127, 130, 134, 140, 142, 154, 166, 167, 170, 176, 181, 209, 215, 217, 236, 259, 275, 277, 281, 293, 296, 307, 313, 319, 320, 323, 329, 337, 343, 347, 349, 370, 376, 379, 382, 392, 400, 407, 412, 415, 424, 431 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..63.

EXAMPLE

If k=7, then k33333 = 733333 (prime).

If k=49, then k33333 = 4933333 (prime).

If k=95, then k33333 = 9533333 (prime).

MATHEMATICA

Select[Range[500], PrimeQ[FromDigits[Join[IntegerDigits[#], {3, 3, 3, 3, 3} ]]]&] (* Harvey P. Dale, Jun 20 2011 *)

PROG

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

CROSSREFS

Sequence in context: A247590 A027830 A134043 * A002643 A276504 A039287

Adjacent sequences:  A102370 A102371 A102372 * A102374 A102375 A102376

KEYWORD

base,nonn

AUTHOR

Parthasarathy Nambi, Feb 22 2005

STATUS

approved

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Last modified February 20 04:19 EST 2018. Contains 299358 sequences. (Running on oeis4.)