A118556 - OEIS

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A118556

Lucky numbers for which the product of the digits is also a lucky number.

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 A346303

Adjacent sequences: A118553 A118554 A118555 * A118557 A118558 A118559

KEYWORD

base,nonn

AUTHOR

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

STATUS

approved