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A103188 Numbers k such that k711 is prime. 1
2, 5, 10, 13, 26, 28, 38, 43, 44, 47, 49, 52, 55, 56, 58, 68, 71, 77, 85, 86, 91, 97, 98, 104, 110, 121, 125, 127, 131, 133, 136, 142, 143, 148, 149, 160, 167, 170, 176, 181, 182, 184, 185, 187, 188, 190, 197, 211, 218, 223, 224, 229, 232, 239, 241, 244, 245, 247, 257, 265 (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 k711 = 2711 (prime).

If k=43, then k711 = 43711 (prime).

If k=58, then k711 = 58711 (prime).

MATHEMATICA

Select[Range[300], PrimeQ[1000#+711]&] (* Harvey P. Dale, Jul 21 2016 *)

PROG

(MAGMA) [ n: n in [1..700] | IsPrime(Seqint([1, 1, 7] cat Intseq(n))) ]; // Vincenzo Librandi, Feb 03 2011

CROSSREFS

Cf. A103118.

Sequence in context: A018571 A064233 A051952 * A281229 A185647 A064392

Adjacent sequences:  A103185 A103186 A103187 * A103189 A103190 A103191

KEYWORD

base,nonn

AUTHOR

Parthasarathy Nambi, Mar 18 2005

STATUS

approved

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Last modified August 4 16:59 EDT 2021. Contains 346454 sequences. (Running on oeis4.)