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A118643 Lucky numbers n whose prime factors are also lucky numbers. 1
1, 3, 7, 9, 13, 21, 31, 37, 43, 49, 63, 67, 73, 79, 93, 111, 127, 129, 151, 163, 169, 189, 193, 201, 211, 219, 223, 237, 241, 259, 273, 283, 307, 331, 349, 367, 409, 421, 433, 463, 487, 489, 511, 541, 553, 559, 577, 579, 601, 613, 619, 631, 643, 651, 673, 723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

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

CROSSREFS

Cf. A000959.

Cf. A043772 (superset).

Sequence in context: A291344 A297002 A111250 * A043772 A176553 A109370

Adjacent sequences:  A118640 A118641 A118642 * A118644 A118645 A118646

KEYWORD

easy,nonn

AUTHOR

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

STATUS

approved

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Last modified November 15 06:32 EST 2019. Contains 329144 sequences. (Running on oeis4.)