This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A102339 Numbers k such that k333 is prime. 1
 2, 5, 7, 10, 16, 17, 19, 20, 23, 29, 31, 38, 41, 49, 50, 55, 56, 59, 61, 64, 71, 76, 79, 85, 92, 100, 101, 103, 121, 134, 136, 139, 140, 143, 149, 154, 155, 161, 175, 176, 178, 182, 184, 188, 208, 209, 211, 217, 220, 232, 236, 239, 241, 244, 265, 266, 269, 271, 272, 274, 286, 287, 295, 299, 301, 308 (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 If k=2, then k333 = 2333 (prime). If k=49, then k333 = 49333 (prime). If k=92, then k333 = 92333 (prime) MATHEMATICA Select[Range[400], PrimeQ[FromDigits[Join[IntegerDigits[#], {3, 3, 3}]]]&] (* Harvey P. Dale, Oct 14 2014 *) PROG (MAGMA) [ n: n in [1..700] | IsPrime(Seqint([3, 3, 3] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 04 2011 CROSSREFS Cf. A101472. Sequence in context: A018270 A080180 A159942 * A172410 A266594 A103871 Adjacent sequences:  A102336 A102337 A102338 * A102340 A102341 A102342 KEYWORD nonn,base AUTHOR Parthasarathy Nambi, Feb 20 2005 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified March 20 08:01 EDT 2018. Contains 300961 sequences. (Running on oeis4.)