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A102527 Numbers k such that k111111 is prime. 2
29, 34, 61, 71, 80, 85, 89, 94, 101, 103, 106, 107, 115, 118, 122, 124, 128, 131, 149, 158, 163, 166, 193, 194, 199, 205, 212, 233, 248, 251, 256, 265, 268, 277, 290, 316, 323, 326, 328, 346, 347, 355, 356, 361, 365, 367, 382, 383, 386, 389, 394, 398, 404, 424, 430, 431, 436, 439, 452, 454, 457 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

EXAMPLE

If k=29, then k111111 = 29111111 (prime).

If k=101, then k111111 = 101111111 (prime).

If k=122, then k111111 = 122111111 (prime).

MATHEMATICA

ect[Range[500], PrimeQ[FromDigits[Join[IntegerDigits[#], {1, 1, 1, 1, 1, 1} ]]]&] (* Harvey P. Dale, Aug 22 2011 *)

PROG

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

CROSSREFS

Sequence in context: A031172 A159022 A280643 * A039307 A043130 A043910

Adjacent sequences:  A102524 A102525 A102526 * A102528 A102529 A102530

KEYWORD

base,nonn

AUTHOR

Parthasarathy Nambi, Feb 24 2005

STATUS

approved

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Last modified December 3 11:58 EST 2021. Contains 349462 sequences. (Running on oeis4.)