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A103590 Numbers k such that the string k23571113 represents a prime number. 2

%I #15 Sep 08 2022 08:45:17

%S 12,24,30,48,59,62,68,78,84,89,99,101,111,114,131,141,146,153,159,162,

%T 173,185,191,194,198,206,209,210,231,233,240,243,245,269,282,296,300,

%U 311,353,357,363,365,366,374,378,381,383,386,390,393,399,450,458,462

%N Numbers k such that the string k23571113 represents a prime number.

%H Harvey P. Dale, <a href="/A103590/b103590.txt">Table of n, a(n) for n = 1..1000</a>

%e If k=12, then k23571113 = 1223571113 (prime).

%e If k=59, then k23571113 = 5923571113 (prime).

%e If k=99, then k23571113 = 9923571113 (prime).

%t With[{c={2,3,5,7,1,1,1,3}},Select[Range[500],PrimeQ[FromDigits[Join[ IntegerDigits[ #],c]]]&]] (* _Harvey P. Dale_, Apr 03 2013 *)

%o (Magma) [ n: n in [1..700] | IsPrime(Seqint([3, 1, 1, 1, 7, 5, 3, 2] cat Intseq(n))) ]; // _Vincenzo Librandi_, Feb 03 2011

%K base,nonn

%O 1,1

%A _Parthasarathy Nambi_, Mar 23 2005

%E More terms from _Jon E. Schoenfield_, May 16 2010

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Last modified March 29 08:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)