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A363635
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Ludic numbers that are products of smaller ludic numbers.
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2
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1, 25, 77, 91, 115, 119, 121, 143, 161, 175, 221, 235, 265, 287, 301, 329, 377, 407, 415, 445, 481, 493, 497, 517, 535, 581, 595, 625, 667, 697, 749, 805, 841, 851, 865, 913, 943, 1015, 1043, 1045, 1105, 1177, 1207, 1225, 1247, 1351, 1363, 1375, 1391, 1403
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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EXAMPLE
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1 is a term because it is a ludic number and equals the empty product.
25 is a term because 25 = 5*5 and both 25 and 5 are ludic numbers.
1015 is a term because 1015 = 5*7*29 and both 1015 and the three factors 5, 7, and 29 are ludic numbers. (This is the first term that requires more than two factors.)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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