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

 

Logo

Many excellent designs for a new banner were submitted. We will use the best of them in rotation.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A138867 First two digits of n-th even superperfect number A061652(n). 4
2, 4, 16, 64, 40, 65, 26, 10, 11, 30, 81, 85, 34, 26, 52, 73, 22, 12, 95, 14, 23, 17, 14, 21, 22, 20, 42, 26, 26, 25, 37 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Also, first two digits of n-th superperfect number A019279(n), if there are no odd superperfect numbers.

LINKS

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

CROSSREFS

Cf. A019279, A061652, A138862, A138868, A138869, A138873.

Sequence in context: A005027 A153969 A153966 * A138868 A138871 A001901

Adjacent sequences:  A138864 A138865 A138866 * A138868 A138869 A138870

KEYWORD

base,more,nonn

AUTHOR

Omar E. Pol, Apr 02 2008

EXTENSIONS

Terms beyond a(12) from R. J. Mathar, Feb 05 2010

STATUS

approved

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

Content is available under The OEIS End-User License Agreement .

Last modified April 24 20:02 EDT 2014. Contains 240988 sequences.