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Search: id:A125499
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| A125499 |
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Deficient even numbers. |
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+0
1
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| 2, 4, 8, 10, 14, 16, 22, 26, 32, 34, 38, 44, 46, 50, 52, 58, 62, 64, 68, 74, 76, 82, 86, 92, 94, 98, 106, 110, 116, 118, 122, 124, 128, 130, 134, 136, 142, 146, 148, 152, 154, 158, 164, 166, 170, 172, 178, 182, 184, 188, 190, 194, 202, 206, 212, 214, 218, 226, 230
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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R. J. Mathar, Table of n, a(n) for n = 1..3375
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EXAMPLE
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22 is in the sequence because it is even and its sum of divisors 1+2+11+22=36 is less than 2*22.
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MAPLE
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with(numtheory): a:=proc(n) if sigma(n)<2*n and n mod 2 = 0 then n else fi end: seq(a(n), n=1..290); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 01 2007
isA005100 := proc(n) if numtheory[sigma](n) < 2*n then RETURN(true) ; else RETURN(false) ; fi ; end : for n from 2 to 800 by 2 do if isA005100(n) then printf("%d, ", n) ; fi ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 07 2007
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CROSSREFS
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Cf. A005100 = deficient numbers.
Sequence in context: A071703 A010069 A132895 this_sequence A153974 A034822 A050567
Adjacent sequences: A125496 A125497 A125498 this_sequence A125500 A125501 A125502
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KEYWORD
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nonn
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AUTHOR
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Tanya Khovanova (tanyakh(AT)yahoo.com), Dec 27 2006
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 01 2007
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