login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A092591 Exponents at which 1+A063395[2^n] is a power of 2. 0
1, 2, 3, 4, 6, 7, 12, 15, 16, 18, 30, 31, 60, 88, 106, 126 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Numbers n such that A065395[n]=sigma[phi[n]]-phi[sigma[n]].

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

At exponents n=1, 3, 7, 15, 31: A065395[2^n]+1=2, while at n=2, 4, 6, 12, 16, 18, 30, 60, 88, 106, 126: A065395[2^n]+1=2^n

CROSSREFS

Cf. A000203, A000010, A065395, A092584-A092590.

Sequence in context: A018534 A018276 A057732 * A039947 A096477 A039059

Adjacent sequences:  A092588 A092589 A092590 * A092592 A092593 A092594

KEYWORD

nonn

AUTHOR

Labos Elemer, Mar 03 2004

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 6 15:25 EST 2016. Contains 278781 sequences.