A073764 a(n) = least number x such that A045763(x)=n or 0 if no such number exists.

6, 0, 10, 15, 14, 21, 18, 35, 22, 33, 26, 39, 0, 65, 30, 36, 38, 57, 44, 95, 46, 63, 42, 115, 50, 64, 58, 87, 54, 75, 68, 155, 60, 99, 74, 111, 72, 185, 66, 117, 86, 129, 92, 215, 94, 141, 78, 235, 84, 105, 98, 100, 96, 265, 90, 135, 118, 147, 122, 183, 108, 305, 102

Offset

1,1

Comments

A070297 without its term a(0). [From R. J. Mathar, Sep 23 2008]

Links

Table of n, a(n) for n=1..63.

Example

A045763(x)=5 first holds if x=14 because unrelated set of 14={4,6,8,10,12} has 5 entries. No solutions were found for n=2,13,67,93 when tested at <100000.

Mathematica

t=Table[0, {100}]; Do[s=n+1-DivisorSigma[0, n]-EulerPhi[n]; If[s<101&&t[[s]]==0, t[[s]]=n], {n, 1, 100000}]; t

Crossrefs

Cf. A045763, A073757-A073766.

Sequence in context: A382769 A117006 A294345 * A158897 A033458 A068308

Adjacent sequences: A073761 A073762 A073763 * A073765 A073766 A073767

Keyword

nonn

Author

Labos Elemer, Aug 08 2002

Status

approved