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Search: id:A059267
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| A059267 |
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Numbers n with 2 divisors d1 and d2 having difference 2: d2 - d1 = 2; equivalently, numbers that are 0 mod (4) or have a divisor d of the form d = m^2 - 1. |
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+0
4
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| 3, 4, 6, 8, 9, 12, 15, 16, 18, 20, 21, 24, 27, 28, 30, 32, 33, 35, 36, 39, 40, 42, 44, 45, 48, 51, 52, 54, 56, 57, 60, 63, 64, 66, 68, 69, 70, 72, 75, 76, 78, 80, 81, 84, 87, 88, 90, 92, 93, 96, 99, 100, 102, 104, 105, 108, 111, 112, 114, 116, 117, 120, 123, 124, 126, 128
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A099475(a(n)) > 0: complement of A099477; A008586, A008585, and A037074 are subsequences - Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Oct 18 2004
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EXAMPLE
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a(18) = 35 because 5 and 7 divides 35 and 7 - 5 = 2
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MAPLE
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with(numtheory): for n from 1 to 1000 do flag := 1: if n mod 4 = 0 then printf(`%d, `, n):flag := 0 fi: for m from 2 to ceil(sqrt(n)) do if n mod (m^2-1) = 0 and flag=1 then printf(`%d, `, n); break fi: od: od:
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CROSSREFS
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Adjacent sequences: A059264 A059265 A059266 this_sequence A059268 A059269 A059270
Sequence in context: A138924 A024324 A036446 this_sequence A049433 A135251 A088070
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KEYWORD
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nonn
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AUTHOR
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Avi Peretz (njk(AT)netvision.net.il), Jan 23 2001
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EXTENSIONS
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More terms from James A. Sellers (sellersj(AT)math.psu.edu), Jan 24 2001
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