A109069 Numbers n such that the string n2323 is prime.

1, 3, 4, 6, 12, 19, 22, 25, 43, 48, 52, 54, 57, 63, 66, 67, 70, 73, 82, 84, 85, 87, 111, 132, 139, 145, 150, 151, 157, 159, 160, 172, 175, 187, 195, 201, 204, 210, 211, 213, 216, 217, 223, 228, 235, 238, 241, 256, 258

Offset

1,2

Links

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

Example

n=1 is in the sequence because n2323 = 12323 is prime.
n=87 is in the sequence because  n2323 = 872323 is prime.

Maple

select(t -> isprime(10^4*t+2323), [$1..1000]); # Robert Israel, Mar 05 2020

Crossrefs

Sequence in context: A024373 A111159 A210523 * A329953 A329671 A124571

Adjacent sequences: A109066 A109067 A109068 * A109070 A109071 A109072

Keyword

nonn,base

Author

Parthasarathy Nambi, Aug 17 2005

Status

approved