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

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A055724 Number of lucky twins <= 10^n. 0
1, 2, 7, 33, 178, 1162, 7669, 55548, 419174, 3274570, 26298112 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..10.

W. Schneider, Lucky Numbers

CROSSREFS

Cf. A000959.

Sequence in context: A080119 A162257 A214954 * A054727 A086618 A224769

Adjacent sequences:  A055721 A055722 A055723 * A055725 A055726 A055727

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Jun 09 2000

EXTENSIONS

a(7),a(8),a(9) were calculated by Walter Schneider (wschnei(AT)t-online.de).

a(10) from Robert G. Wilson v, Aug 22 2015.

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 November 18 12:21 EST 2017. Contains 294891 sequences.