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A118556 Lucky numbers for which the product of the digits is also a lucky number. 1
1, 3, 7, 9, 13, 31, 33, 37, 73, 79, 111, 133, 135, 171, 331, 357, 535, 537, 553, 717, 735, 739, 937, 1117, 1155, 1179, 1197, 1357, 1395, 1711, 1731, 1771, 3111, 3171, 3175, 3571, 3915, 3951, 3999, 5137, 5139, 5151, 5371, 5377, 5713, 5737, 5913, 5997, 7111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

EXAMPLE

79 is in the sequence because (1) it is a lucky number and (2) the product of its digits 7*9=63 is also a lucky number.

CROSSREFS

Cf. A000959, A007954.

Sequence in context: A032664 A166733 A172987 * A279617 A199919 A178207

Adjacent sequences:  A118553 A118554 A118555 * A118557 A118558 A118559

KEYWORD

base,nonn

AUTHOR

Luc Stevens (lms022(AT)yahoo.com), May 07 2006

STATUS

approved

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Last modified November 29 04:03 EST 2020. Contains 338756 sequences. (Running on oeis4.)