A139766 - OEIS

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A139766

A number n is included in the sequence if and only if the n-th integer from among those positive integers which are coprime to n+1 = the (n+1)-st integer from among those positive integers which are coprime to n.

0

3, 15, 104, 164, 255, 2625, 2834, 11715, 18315, 48704, 49215, 64004, 65535, 73124, 131144, 215775, 491535, 525986, 546272, 568815, 952575, 1925564, 5781434, 5861583, 13496384, 14409548, 17646615, 17949434, 20171384, 21475124, 22632285

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OFFSET

1,1

COMMENTS

So far it appears that this is a proper subset of A001274.

LINKS

Table of n, a(n) for n=1..31.

FORMULA

Indices n such that A126356(n) = A126357(n). - Ray Chandler

CROSSREFS

Cf. A001274, A069213, A126356, A126357.

Sequence in context: A358738 A331689 A001274 * A003276 A136092 A338724

Adjacent sequences: A139763 A139764 A139765 * A139767 A139768 A139769

KEYWORD

nonn

AUTHOR

Leroy Quet, Nov 07 2007

EXTENSIONS

More terms from Stefan Steinerberger, Nov 07 2007

a(8) onwards from Ray Chandler, Jul 01 2009

STATUS

approved