A109605 Numbers n such that 100000n + 91111 is prime.

6, 7, 12, 18, 30, 39, 67, 69, 72, 82, 96, 105, 109, 118, 120, 123, 132, 142, 144, 147, 148, 156, 159, 166, 175, 181, 184, 195, 204, 205, 211, 223, 225, 228, 243, 244, 246, 247, 259, 270, 271, 288, 303, 312, 334, 342, 343, 345, 351, 355, 364, 366, 376, 379

Offset

1,1

Links

Table of n, a(n) for n=1..54.

Example

96 is in the sequence because 100000*96+91111 = 9691111 is prime.

Maple

c:=proc(x, y) local s: s:=proc(m) nops(convert(m, base, 10)) end: x*10^s(y)+y: end: a:=proc(n) if isprime(c(n, 91111)) then n fi end: seq(a(n), n=0..400); # c is the process which concatenates two positive integers # Emeric Deutsch, Aug 07 2005

Mathematica

Select[Range[400], PrimeQ[100000#+91111]&] (* Harvey P. Dale, Jul 31 2014 *)

Prog

(Magma) [ n: n in [0..400] | IsPrime(100000*n+91111) ];
(PARI) is(n)=isprime(100000*n+91111) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A155942 A315834 A315835 * A331860 A069198 A069136

Adjacent sequences: A109602 A109603 A109604 * A109606 A109607 A109608

Keyword

nonn,easy

Author

Parthasarathy Nambi, Jul 30 2005

Extensions

More terms from Emeric Deutsch, Aug 07 2005

Status

approved