|
Search: id:A079651
|
|
|
| A079651 |
|
Prime numbers using only the straight digits 1, 4 and 7. |
|
+0
1
|
|
| 7, 11, 17, 41, 47, 71, 1117, 1171, 1447, 1471, 1741, 1747, 1777, 4111, 4177, 4441, 4447, 7177, 7411, 7417, 7477, 7717, 7741, 11117, 11171, 11177, 11411, 11447, 11471, 11717, 11777, 14177, 14411, 14447, 14717, 14741, 14747, 14771, 17117, 17417
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
EXAMPLE
|
a(3)=17 because 17 is a prime and consists of straight digits 1 and 7 only.
|
|
MATHEMATICA
|
Select[Range[17450], PrimeQ[ # ] && Union[ Join[ IntegerDigits[ # ], {1, 4, 7}]] == {1, 4, 7} &]
|
|
CROSSREFS
|
Cf. A028373.
Adjacent sequences: A079648 A079649 A079650 this_sequence A079652 A079653 A079654
Sequence in context: A068674 A107642 A134572 this_sequence A097956 A094104 A020455
|
|
KEYWORD
|
base,nonn
|
|
AUTHOR
|
Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jan 23 2003
|
|
EXTENSIONS
|
Corrected and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 24 2003
|
|
|
Search completed in 0.002 seconds
|
