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2, 4, 16, 256, 496, 976, 2626, 3256, 3706, 5188, 11716, 13366, 18316, 22936, 25546, 46216, 49216, 49336, 57646, 65536, 164176, 184636, 198316, 215776, 286996, 307396, 319276, 388246, 397486, 415276, 491536, 568816, 589408, 686986, 840256, 914176, 952576, 983776
(list;
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refs;
listen;
history;
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internal format)
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OFFSET
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1,1
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COMMENTS
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All terms are even. Does lim_{n->oo} log(a(n))/log(n) exist?
Are all terms except 2 congruent to 4 (mod 6)? - Robert Israel, Feb 27 2018 [a(3710) = 3044760173456 is the next term after 2 that is congruent to 2 (mod 6). - Amiram Eldar, Jul 17 2022]
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LINKS
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MAPLE
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select(t -> numtheory:-phi(t)+ numtheory:-phi(t-1)=numtheory:-phi(2*t), [seq(i, i=2..10^6, 2)]); # Robert Israel, Feb 27 2018
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PROG
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(PARI) for(n=2, 200000, if(eulerphi(n) + eulerphi(n-1) == eulerphi(2*n), print1(n, ", ")))
(Magma) [n: n in [2..10^6] | EulerPhi(n)+EulerPhi(n-1) eq EulerPhi(2*n)]; // Bruno Berselli, Feb 27 2018
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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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STATUS
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approved
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