The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A109605 Numbers n such that 100000n + 91111 is prime. 0
 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 (list; graph; refs; listen; history; text; internal format)
 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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 15 22:50 EDT 2024. Contains 373412 sequences. (Running on oeis4.)