A103541 - OEIS

A103541

Numbers n such that n23571113171923 is prime.

1, 3, 7, 10, 12, 25, 60, 81, 87, 136, 159, 169, 171, 205, 213, 220, 235, 238, 240, 241, 259, 324, 339, 340, 411, 448, 459, 511, 513, 537, 543, 558, 642, 652, 670, 688, 690, 705, 721, 754, 768, 775, 777, 795, 801, 808, 834, 862, 885, 892, 936, 943, 961, 964

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OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

EXAMPLE

At n=1, n23571113171923 = 123571113171923 (prime).

At n=25, n23571113171923 = 2523571113171923 (prime).

At n=136, n23571113171923 = 13623571113171923 (prime).

MAPLE

select(t -> isprime(t*10^14+23571113171923), [$0..1000]); # Robert Israel, Sep 28 2018

MATHEMATICA

fQ[n_] := PrimeQ[ FromDigits[ Join[ IntegerDigits[n], {2, 3, 5, 7, 1, 1, 1, 3, 1, 7, 1, 9, 2, 3}]]]; Select[ Range[ 983], fQ[ # ] &] (* Robert G. Wilson v, Mar 26 2005 *)

Select[Range[1000], PrimeQ[10^14 # + 23571113171923] &] (* Vincenzo Librandi, Sep 28 2018 *)

CROSSREFS

Sequence in context: A310181 A310182 A020679 * A183178 A340604 A366321

Adjacent sequences: A103538 A103539 A103540 * A103542 A103543 A103544

KEYWORD

base,nonn

AUTHOR

Parthasarathy Nambi, Mar 22 2005

EXTENSIONS

More terms from Robert G. Wilson v, Mar 26 2005

STATUS

approved