|
| |
|
|
A004624
|
|
Divisible only by primes congruent to 6 mod 7.
|
|
1
|
|
|
|
1, 13, 41, 83, 97, 139, 167, 169, 181, 223, 251, 293, 307, 349, 419, 433, 461, 503, 533, 587, 601, 643, 727, 769, 797, 811, 839, 853, 881, 937, 1021, 1049, 1063, 1079, 1091, 1217, 1231, 1259, 1261, 1301, 1399, 1427, 1483, 1511, 1553, 1567, 1609, 1637, 1681
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
|
|
|
MATHEMATICA
|
ok[1]=True; ok[n_]:=And@@(Mod[#, 7]==6&)/@FactorInteger[n][[All, 1]]; Select[Range[5000], ok] (* Vincenzo Librandi, Aug 20 2012 *)
|
|
|
PROG
|
(Magma) [n: n in [1..2000] | forall{d: d in PrimeDivisors(n) | d mod 7 eq 6}]; // Vincenzo Librandi, Aug 20 2012
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
|
|
|
EXTENSIONS
|
|
|
|
STATUS
|
approved
|
| |
|
|
