A102545 Numbers k such that k999999 is prime.

2, 4, 16, 19, 20, 23, 29, 40, 43, 50, 59, 62, 71, 83, 89, 107, 115, 116, 122, 134, 145, 155, 157, 160, 167, 184, 197, 218, 250, 251, 262, 268, 278, 284, 289, 292, 298, 311, 314, 335, 344, 346, 347, 349, 353, 355, 361, 362, 379, 389, 398, 400, 401, 425, 431, 437, 439, 452, 457, 470, 475, 485, 491

Offset

1,1

Links

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

Example

If k=2, then k999999 = 2999999 (prime).
If k=43, then k999999 = 43999999 (prime).
If k=89, then k999999 = 89999999 (prime).

Prog

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

Crossrefs

Sequence in context: A067709 A229238 A212202 * A045521 A338766 A242205

Adjacent sequences: A102542 A102543 A102544 * A102546 A102547 A102548

Keyword

base,nonn

Author

Parthasarathy Nambi, Feb 24 2005

Status

approved