|
| |
|
|
A164770
|
|
Numbers n with property that average digit of n^2 is 2.
|
|
8
|
|
|
|
145, 152, 179, 190, 251, 3182, 3190, 3199, 3245, 3290, 3335, 3362, 3380, 3470, 3479, 3496, 3550, 3649, 3650, 3749, 3821, 4001, 4010, 4100, 4495, 4496, 4540, 4550, 4585, 4595, 4639, 4649, 4810, 4820, 4910, 4990, 5701, 5710, 5755, 5800, 5900, 6350, 6404
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
There are 6368 such n's < 10^7: see link to 15217.html.
|
|
|
LINKS
|
Table of n, a(n) for n=1..43.
Zak Seidov, Average digit of n^2 is 2.
Zak Seidov, Case with trailing zeros.
|
|
|
EXAMPLE
|
a(1)=145 because 145^2=21025 and (2+1+0+2+5)/5=2.
|
|
|
PROG
|
(PARI) dsum(n)={my(s=0); while(n>9, s+=n%10; n\=10); s+n}; for(n=1, 1e6, if(dsum(n^2)/#Str(n^2)==2, print1(n", ")))
|
|
|
CROSSREFS
|
Sequence in context: A099648 A043652 A296889 * A159777 A326258 A051414
Adjacent sequences: A164767 A164768 A164769 * A164771 A164772 A164773
|
|
|
KEYWORD
|
base,nonn,easy
|
|
|
AUTHOR
|
Zak Seidov, Aug 26 2009
|
|
|
EXTENSIONS
|
Program by Charles R Greathouse IV, Nov 01 2009
Edited by Charles R Greathouse IV, Mar 23 2010
|
|
|
STATUS
|
approved
|
| |
|
|
