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!)
A063773 Smallest number that is centered polygonal in exactly n ways. 2

%I

%S 4,10,19,31,61,211,181,361,631,841,1261,5461,2521,6931,18481,20791,

%T 13861,27721,41581,83161,138601,245701,235621,180181,556921,360361,

%U 540541,1670761,1081081,1413721,2162161,3603601,4324321,3063061

%N Smallest number that is centered polygonal in exactly n ways.

%H Donovan Johnson, <a href="/A063773/b063773.txt">Table of n, a(n) for n = 1..90</a>

%e 19 is the smallest number that is centered k-gonal for exactly three k (k = 3, 6, or 18). Hence a(3) = 19

%K nonn

%O 1,1

%A _David W. Wilson_, Aug 15 2001

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 17 20:06 EST 2022. Contains 350410 sequences. (Running on oeis4.)