|
|
A094104
|
|
Primes of the form 2*prime(n) + prime(n+1).
|
|
5
|
|
|
7, 11, 17, 43, 53, 61, 89, 179, 241, 313, 331, 353, 449, 593, 673, 683, 691, 719, 733, 809, 859, 1021, 1051, 1237, 1259, 1321, 1481, 1709, 1741, 1933, 1979, 2083, 2111, 2137, 2221, 2237, 2311, 2333, 2371, 2473, 2531, 2741, 2767, 2957, 3163, 3469, 3643
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
No intersection with A094105 (Primes of the form prime(m) + 2*prime(m+1)). In general, an integer of the form 2*prime(m) + prime(m+1)) cannot be of the form prime(n) + 2*prime(n+1). - Zak Seidov, May 03 2014
|
|
LINKS
|
|
|
EXAMPLE
|
a(7) = 2*29 + 31 = 89.
|
|
MATHEMATICA
|
f[n_] := (2Prime[n] + Prime[n + 1]); f[ # ] & /@ Select[Range[160], PrimeQ[f[ # ]] &] (* Robert G. Wilson v *)
Select[2#[[1]]+#[[2]]&/@Partition[Prime[Range[300]], 2, 1], PrimeQ] (* Harvey P. Dale, Jul 19 2022 *)
|
|
PROG
|
(PARI) q=2; forprime(p=3, 1300, if(isprime(r=2*q+p), print1(r, ", ")); q=p)
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|