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A118643 Lucky numbers n whose prime factors are also lucky numbers. 2

%I #11 Nov 16 2019 10:29:14

%S 1,3,7,9,13,21,31,37,43,49,63,67,73,79,93,111,127,129,151,163,169,189,

%T 193,201,211,219,223,237,241,259,273,283,307,331,349,367,409,421,433,

%U 463,487,489,511,541,553,559,577,579,601,613,619,631,643,651,673,723

%N Lucky numbers n whose prime factors are also lucky numbers.

%H Amiram Eldar, <a href="/A118643/b118643.txt">Table of n, a(n) for n = 1..10000</a>

%e 189 is included since 189 is lucky and 189 = 3*3*3*7 has prime factors that are all lucky.

%Y Cf. A000959.

%Y Cf. A043772 (superset).

%K easy,nonn

%O 1,2

%A Adam Panagos (adam.panagos(AT)gmail.com), May 10 2006

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Last modified March 29 08:01 EDT 2024. Contains 371265 sequences. (Running on oeis4.)