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.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
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
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
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.

License Agreements, Terms of Use, Privacy Policy. .

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