|
| |
|
|
A117708
|
|
Numbers that are both lucky numbers and Chen primes.
|
|
1
|
|
|
|
3, 7, 13, 31, 37, 67, 127, 211, 307, 409, 487, 541, 577, 631, 769, 787, 937, 991, 1009, 1039, 1117, 1201, 1291, 1459, 1471, 1567, 1777, 1801, 2251, 2281, 2467, 2557, 2647, 2971, 3037, 3187, 3259, 3307, 3559, 3709, 3847, 3889, 4441, 4567, 4801, 4969, 4987
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
LINKS
|
Amiram Eldar, Table of n, a(n) for n = 1..10000
|
|
|
MATHEMATICA
|
lst = Range[1, 5000, 2]; i = 2; While[ i <= (len = Length@lst) && (k = lst[[i]]) <= len, lst = Drop[lst, {k, len, k}]; i++ ]; chenQ[n_] := PrimeQ[n] && Plus @@ Last /@ FactorInteger[n + 2] < 3; Select[lst, chenQ@# &] (* Robert G. Wilson v, May 12 2006 *)
|
|
|
CROSSREFS
|
Intersection of A000959 and A109611.
Subsequence of A031157.
Sequence in context: A136051 A100750 A105435 * A093431 A243765 A256148
Adjacent sequences: A117705 A117706 A117707 * A117709 A117710 A117711
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
Jani Melik, Apr 27 2006
|
|
|
EXTENSIONS
|
Corrected and extended by Robert G. Wilson v, May 12 2006
|
|
|
STATUS
|
approved
|
| |
|
|
