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!)
A258932 Numbers n such that 10^n + 103 is prime. 1
1, 3, 4, 5, 7, 9, 10, 11, 27, 35, 85, 169, 209, 221, 321, 347, 603, 610, 1229, 1391, 2171, 2303, 2679, 3977, 4545, 5721, 7090, 35877 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
For n = 3, a(3) = 10^3 + 103 = 1103, which is prime.
MATHEMATICA
Select[Range[5000], PrimeQ[10^# + 103] &]
PROG
(Magma) [n: n in [1..600] | IsPrime(10^n+103)];
(PARI) is(n)=ispseudoprime(10^n+103) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequences of the type 10^n+k: A049054 (k=3), A088274 (k=7), A088275 (k=9), A095688 (k=13), A108052 (k=19), A108050 (k=21), A108312 (k=27), A107083 (k=31), A107084 (k=33), A135109 (k=37), A135108 (k=39), A108049 (k=43), A108054 (k=49), A135118 (k=51), A135119 (k=57), A135116 (k=61), A135115 (k=63), A135113 (k=67), A135114 (k=69), A135132 (k=73), A135131 (k=79), A137848 (k=81), A135117 (k=87), A110918 (k=91), A135112 (k=93), A135107 (k=97), A110980 (k=99), this sequence (k=103), A258933 (k=109), A165508 (k=111), A248349 (k=123456789), A248351 (k=987654321).
Sequence in context: A153329 A213637 A047251 * A183213 A183172 A136495
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, Jun 15 2015
EXTENSIONS
a(26)-a(28) from Jens Kruse Andersen, Jun 23 2015
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 April 16 05:35 EDT 2024. Contains 371697 sequences. (Running on oeis4.)