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A103541 Numbers n such that n23571113171923 is prime. 1
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 (list; graph; refs; listen; history; text; internal format)
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 A310183

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

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Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)