A102758 Numbers k such that k3333333 is prime.

8, 10, 11, 22, 37, 59, 64, 71, 77, 82, 85, 89, 94, 98, 103, 109, 116, 119, 130, 134, 142, 145, 151, 154, 158, 166, 173, 178, 184, 215, 229, 236, 247, 250, 253, 259, 275, 298, 299, 301, 310, 316, 317, 323, 346, 347, 364, 380, 385, 389, 401, 406, 422, 425, 449, 460, 464, 467, 470

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

If k=8, then k3333333 = 83333333 (prime).
If k=71, then k3333333 = 713333333 (prime).
If k=103, then k3333333 = 1033333333 (prime).

Mathematica

Select[Range[500], PrimeQ[# 10^7+3333333]&] (* Harvey P. Dale, Aug 28 2019 *)

Prog

(Magma) [ n: n in [1..700] | IsPrime(Seqint([3, 3, 3, 3, 3, 3, 3] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 03 2011

Crossrefs

Sequence in context: A062372 A374349 A046031 * A176815 A338473 A336143

Adjacent sequences: A102755 A102756 A102757 * A102759 A102760 A102761

Keyword

base,nonn

Author

Parthasarathy Nambi, Feb 25 2005

Status

approved