

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
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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



