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A154369
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Composites k such that gpf(k) mod lpf(k) is prime.
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0
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15, 33, 35, 45, 51, 65, 69, 75, 85, 87, 99, 115, 119, 123, 133, 135, 141, 143, 153, 159, 161, 165, 175, 177, 185, 207, 213, 215, 217, 225, 231, 235, 245, 249, 255, 259, 261, 265, 267, 297, 303, 319, 321, 323, 325, 329, 335, 339, 345, 357, 363, 365, 369, 375
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OFFSET
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1,1
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LINKS
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EXAMPLE
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Composite(35) = 51 = 17*3 and 17 mod 3 = 2 (prime), so 51 is a term.
Composite(46) = 65 = 13*5 and 13 mod 5 = 3 (prime), so 65 is a term.
Composite(53) = 75 = 5*5*3 and 5 mod 3 = 2 (prime), so 75 is a term.
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MAPLE
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A020639 := proc(n) numtheory[factorset](n) ; min(op(%)) ; end proc:
A006530 := proc(n) numtheory[factorset](n) ; max(op(%)) ; end proc:
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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Corrected (133 inserted) and extended by R. J. Mathar, May 05 2010
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STATUS
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approved
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