|
| |
|
|
A180534
|
|
Primes that become a different prime under the mapping 2 <=> 4.
|
|
1
|
|
|
|
23, 43, 223, 229, 233, 239, 241, 257, 263, 421, 433, 439, 443, 449, 457, 463, 521, 541, 1249, 1259, 1283, 1289, 1429, 1459, 1483, 1489, 1523, 1543, 1721, 1741, 2003, 2029, 2099, 2111, 2153, 2221, 2243, 2251, 2281, 2293, 2339, 2347, 2357, 2411, 2417, 2423
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
|
|
|
MATHEMATICA
|
fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 2] || MemberQ[id, 4]) && PrimeQ[ FromDigits[ id /. {2 -> 4, 4 -> 2}] ]]; Select[ Prime@ Range@ 400, fQ]
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
base,nonn
|
|
|
AUTHOR
|
|
|
|
STATUS
|
approved
|
| |
|
|
