login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A119108 Numbers k such that the k-th triangular number contains only digits {1,2,8}. 2

%I #8 Jul 13 2021 01:24:51

%S 1,6,7,47,66,127,487,666,1281,1287,1327,1541,1912,6666,7512,13327,

%T 60352,66666,133327,666666,1333327,6666666,13333327,47375333,66666666,

%U 133333327,666666666,1333333327,6666666666,12750044793,13333333327

%N Numbers k such that the k-th triangular number contains only digits {1,2,8}.

%H G. Resta, <a href="http://www.numbersaplenty.com/tr/tr128.html">Tridigital Triangular Numbers</a>

%Y Cf. A000217, A119107. See A119034 for a table of cross-references.

%K nonn,base

%O 1,2

%A _Giovanni Resta_, May 10 2006

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 25 03:15 EDT 2024. Contains 371964 sequences. (Running on oeis4.)