A102386 Numbers k such that k99999 is prime.

1, 5, 7, 11, 13, 17, 25, 26, 29, 34, 47, 49, 55, 67, 77, 80, 98, 101, 110, 115, 118, 124, 133, 134, 136, 143, 158, 169, 181, 188, 193, 199, 209, 211, 220, 224, 227, 239, 241, 248, 250, 260, 265, 266, 277, 280, 293, 299, 301, 302, 311, 313, 320, 326, 337, 340, 343, 346, 364, 365, 370, 371, 382, 398

Offset

1,2

Links

Table of n, a(n) for n=1..64.

Example

If k=1, then k99999 = 199999 (prime).
If k=34, then k99999 = 3499999 (prime).
If k=98, then k99999 = 9899999 (prime).

Prog

(Magma) [ n: n in [1..700] | IsPrime(Seqint([9, 9, 9, 9, 9] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 04 2011

Crossrefs

Sequence in context: A015914 A023201 A106059 * A348936 A346990 A038958

Adjacent sequences: A102383 A102384 A102385 * A102387 A102388 A102389

Keyword

base,nonn

Author

Parthasarathy Nambi, Feb 22 2005

Status

approved