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!)
A108757 Numbers n such that 1000n + 911 is prime. 0

%I #13 Sep 08 2022 08:45:19

%S 0,3,6,12,17,18,21,23,30,32,33,35,41,47,56,69,72,80,83,87,90,93,95,96,

%T 98,102,104,116,117,123,132,135,137,149,153,159,161,164,167,188,191,

%U 194,201,203,206,210,216,219,224,228,233,237,242,243,245,249,252,254

%N Numbers n such that 1000n + 911 is prime.

%e 0 is in the sequence because 1000*0+911 = 911 is prime.

%e 32 is in the sequence because 1000*32+911 = 32911 is prime.

%p 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,911))=true then n else fi end: seq(a(n),n=0..360); # c is the process which concatenates two positive integers # _Emeric Deutsch_, Aug 07 2005

%o (Magma) [ n: n in [0..300] | IsPrime(1000*n+911) ];

%o (PARI) is(n)=isprime(1000*n+911) \\ _Charles R Greathouse IV_, Jun 13 2017

%K nonn,easy

%O 1,2

%A _Parthasarathy Nambi_, Jul 25 2005

%E More terms from _Emeric Deutsch_, Aug 07 2005

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 August 17 09:16 EDT 2024. Contains 375209 sequences. (Running on oeis4.)