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A152758
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Numbers whose deficiency plus the number of proper divisors is not a prime number (see A152864).
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1
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1, 8, 12, 15, 24, 25, 30, 32, 33, 35, 36, 39, 40, 42, 44, 48, 50, 51, 54, 56, 60, 63, 65, 66, 68, 69, 72, 78, 80, 81, 84, 85, 87, 90, 92, 96, 98, 100, 102, 105, 108, 112, 114, 116, 117, 120, 121, 123, 126, 128, 129, 130, 132, 136, 138, 140, 141, 143, 144, 148, 150, 153
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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MAPLE
| with(numtheory): a := proc (n) if isprime(2*n-sigma(n)+tau(n)-1) = false then n else end if end proc: seq(a(n), n = 1 .. 200); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 08 2009]
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CROSSREFS
| Cf. A000005, A000040, A000203, A032741, A033879, A152757, A152770, A152864.
Sequence in context: A194592 A175132 A031034 * A160258 A071280 A033942
Adjacent sequences: A152755 A152756 A152757 * A152759 A152760 A152761
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KEYWORD
| easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Dec 14 2008
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EXTENSIONS
| Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 08 2009
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