|
|
A174176
|
|
Numbers n such that 10^n-2*n+1 is prime.
|
|
5
|
|
|
2, 5, 14, 42, 72, 74, 354, 1176, 1274, 4815, 6885, 28214
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
MATHEMATICA
|
|
|
PROG
|
(Magma) /* The code gives only the terms up to 354: */ [n: n in [1..600] | IsPrime(10^n-2*n+1) ]
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,more
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|