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A083235 First differences of A063742, the possible values for cototients. 1
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

COMMENTS

Differences between consecutive numbers in the range of A051853.

LINKS

Table of n, a(n) for n=1..105.

FORMULA

a(n) = A063742(n+1) - A063742(n).

EXAMPLE

First missing number in A063742 is 10=A005278[1], so a[10]=2 is the first difference here > 1.

MATHEMATICA

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

CROSSREFS

Sequence in context: A325625 A043288 A057523 * A307609 A043287 A212177

Adjacent sequences:  A083232 A083233 A083234 * A083236 A083237 A083238

KEYWORD

nonn

AUTHOR

Labos Elemer, May 20 2003

EXTENSIONS

Edited by N. J. A. Sloane at the suggestion of Andrew S. Plewe, Jun 23 2007

STATUS

approved

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Last modified November 21 01:23 EST 2019. Contains 329348 sequences. (Running on oeis4.)