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A363634 Lucky numbers that are products of smaller lucky numbers. 2
1, 9, 21, 49, 63, 75, 93, 99, 105, 111, 129, 135, 169, 189, 195, 201, 219, 231, 237, 259, 261, 273, 297, 357, 399, 429, 477, 483, 489, 495, 511, 553, 559, 579, 615, 621, 645, 651, 693, 723, 729, 735, 777, 801, 805, 819, 855, 867, 897, 903, 925, 931, 957, 961 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..54.
EXAMPLE
1 is a term because it is a lucky number and equals the empty product.
21 is a term because 21 = 3*7 and both 21 and the two factors 3 and 7 are lucky numbers.
729 is a term because 729 = 9*9*9 and both 729 and 9 are lucky numbers. (This is the first term that requires more than two factors.)
CROSSREFS
Cf. A000959, A363635, A363636.
Sequence in context: A133762 A160414 A256530 * A118130 A144482 A251212
Adjacent sequences: A363631 A363632 A363633 * A363635 A363636 A363637
KEYWORD
nonn
AUTHOR
Pontus von Brömssen, Jun 19 2023
STATUS
approved

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Last modified August 18 15:26 EDT 2024. Contains 375269 sequences. (Running on oeis4.)