Search: a046339 -id:a046339
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2, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 5, 2, 3, 3, 2, 5, 2, 5, 2, 3, 2, 2, 7, 3, 3, 5, 3, 5, 2, 3, 2, 3, 2, 2, 5, 2, 5, 3, 7, 2, 3, 7, 3, 2, 5, 2, 5, 3, 2, 3, 5, 2, 3, 7, 3, 2, 5, 2, 5, 2, 3, 2, 2, 3, 5, 7, 2, 7, 11, 3, 2, 7, 3, 3, 5, 3, 3, 2, 7, 2, 3, 2, 7, 5, 3, 2, 3, 2, 5, 11, 2, 5, 2, 3, 2, 5, 2, 2, 3, 2, 7, 5
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EXAMPLE
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a(8)=2 since A046339(8) = 32 = 2*2*2*2*2.
a(9)=3 since A046339(9) = 42 = 2*3*7.
a(10)=2 since A046339(10) = 44 = 2*2*11.
a(11)=3 since A046339(11) = 45 = 3*3*5.
a(12)=2 since A046339(12) = 48 = 2*2*2*2*3.
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MAPLE
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A046339 := proc(n) option remember ; if n = 1 then 8 ; else for a from procname(n-1)+1 do if not isprime(a) and numtheory[bigomega](a) mod 2 = 1 then RETURN(a) ; fi; od: fi; end:
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CROSSREFS
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8, 12, 18, 20, 27, 28, 30, 32, 42, 44, 45, 48, 50, 52, 63, 66, 68, 70, 72, 75, 76, 78, 80
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A046340
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Odd composite numbers with an odd number of prime factors (counted with multiplicity).
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+10
4
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27, 45, 63, 75, 99, 105, 117, 125, 147, 153, 165, 171, 175, 195, 207, 231, 243, 245, 255, 261, 273, 275, 279, 285, 325, 333, 343, 345, 357, 363, 369, 385, 387, 399, 405, 423, 425, 429, 435, 455, 465, 475, 477, 483, 507, 531, 539, 549, 555, 561, 567, 575
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A046341
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Composite palindromes with an odd number of prime factors (counted with multiplicity).
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+10
3
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8, 44, 66, 99, 171, 212, 222, 242, 252, 272, 282, 292, 333, 343, 363, 404, 434, 464, 474, 494, 555, 575, 595, 606, 616, 646, 656, 696, 747, 777, 828, 848, 888, 909, 969, 1001, 1221, 1331, 1551, 1771, 2222, 2552, 2882, 3333, 3553, 4004, 4224, 4334, 4554
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