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A083534
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First difference sequence of A007617. Difference between consecutive values not being in the range of phi[A000010].
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5
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2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 1, 1, 2, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 2, 1, 1, 2, 2, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 2, 2, 2, 2, 2, 2, 2, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 2, 2, 2, 2, 1, 1, 2, 2, 2, 1, 1, 2, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 2, 2, 2, 2
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history;
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OFFSET
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1,1
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LINKS
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Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
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FORMULA
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a(n)=A007617[n+1]-A007617[n]
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EXAMPLE
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a(n) is either 2 or 1 since odd numbers are in A007619;
if a(n)=1 then A007619[n+1] is an even number not in
range of phi; n={11,13,14,15,17} are not in the range of
phi and the corresponding differences are {2,1,1,2}.
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MATHEMATICA
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t0[x_] := Table[j, {j, 1, x}] t=Table[EulerPhi[w], {w, 1, 10000}]; u=Union[%]; c=Complement[t0[10000], u]; Delete[c-RotateRight[c], 1]
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PROG
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(Haskell)
a083534 n = a083534_list !! (n-1)
a083534_list = zipWith (-) (tail a007617_list) a007617_list
-- Reinhard Zumkeller, Nov 26 2015
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CROSSREFS
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Cf. A000010, A007617, A002202, A005277, A083531-A083536, A005277.
Sequence in context: A237348 A037813 A159700 * A174664 A027386 A102300
Adjacent sequences: A083531 A083532 A083533 * A083535 A083536 A083537
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KEYWORD
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nonn
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AUTHOR
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Labos Elemer, May 20 2003
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STATUS
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approved
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