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A083536 First differences of noncototients A005278. 6

%I #23 Apr 08 2023 05:02:13

%S 16,8,16,2,6,28,14,16,6,8,4,12,8,16,2,14,16,4,12,4,10,12,16,6,2,6,16,

%T 2,6,12,16,14,4,2,16,4,6,14,8,10,8,24,30,4,4,8,8,28,2,12,2,2,10,8,8,4,

%U 14,4,12,30,8,16,2,14,14,6,2,10,8,16,2,6,2,14,26,6,8,8,14,10,16,8,8,22,2,28

%N First differences of noncototients A005278.

%H Amiram Eldar, <a href="/A083536/b083536.txt">Table of n, a(n) for n = 1..10000</a>

%F a(n) = A005278(n+1) - A005278(n).

%e Missing terms from A051953 are 10,26,34,50,.. so their difference sequence starts with 16,8,16,...

%t t0[x_] := Table[j, {j, 1, x}] t=Table[w-EulerPhi[w], {w, 1, 10000}]; u=Union[%]; Delete[u-RotateRight[u], 1]; c=Complement[t0[10000], u]; Delete[c-RotateRight[c], 1];

%Y Cf. A051953, A005278.

%K nonn

%O 1,1

%A _Labos Elemer_, May 20 2003

%E a(84)-a(85) corrected by _David Ng_, (an error that was noticed by Doug Phillips), Oct 31 2016

%E a(86) corrected and name simplified by _Omar E. Pol_, Nov 04 2016

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)