|
Search: id:A130135
|
|
|
| A130135 |
|
Numbers such that prime(n^3)-n is prime. |
|
+0
1
|
|
| 2, 4, 12, 30, 40, 42, 62, 66, 70, 72, 84, 88, 98, 112, 130, 150, 180
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
EXAMPLE
|
a(1)=2 because prime(2^3)-2 = 19-2 = 17 and 17 is prime,
a(2)=4 because prime(4^3)-4 = 311-4 = 307 and 307 is prime,
a(3)=12 because prime(12^3)-12 = 14741 and 14741 is prime, ...
|
|
MAPLE
|
ts_pra_3:=proc(n) local i, ans; ans := [ ]: for i from 1 to n do if (isprime(ithprime(i^(3))-i)) then ans := [ op(ans), i ]: fi: od; RETURN(ans) end: ts_pra_3(200);
|
|
CROSSREFS
|
Cf. A064269 - prime(n)-n is prime, A105962 - prime(n^2)-n is prime.
Adjacent sequences: A130132 A130133 A130134 this_sequence A130136 A130137 A130138
Sequence in context: A027132 A096581 A080876 this_sequence A048618 A083554 A059412
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Jani Melik (jani_melik(AT)hotmail.com), Aug 01 2007
|
|
|
Search completed in 0.002 seconds
|
