|
| |
|
|
A093402
|
|
Primes of the form 40*R_n + 9, where R_n is the repunit (A002275) of length n.
|
|
2
| |
|
|
449, 44449, 444449, 444444444444444444444444444444444444444444444449, 444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444444449
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
COMMENTS
| Primes of the form (4*10^n+41)/9 [From Vincenzo Librandi, Nov 16 2010]
|
|
|
MATHEMATICA
| Select[Table[FromDigits[PadLeft[{9}, n, 4]], {n, 120}], PrimeQ] (* From Harvey P. Dale, May 21 2011 *)
|
|
|
CROSSREFS
| Cf. A056683 (corresponding n).
Sequence in context: A036945 A201182 A012169 * A012062 A079659 A202197
Adjacent sequences: A093399 A093400 A093401 * A093403 A093404 A093405
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Rick L. Shepherd (rshepherd2(AT)hotmail.com), Mar 28 2004
|
| |
|
|
