

A266000


Numbers n such that the symmetric representation of sigma(n) has at least two parts of distinct size.


1



9, 21, 25, 27, 33, 35, 39, 45, 49, 50, 51, 55, 57, 63, 65, 69, 70, 75, 77, 81, 85, 87, 91, 93, 95, 98, 99, 105, 110, 111, 115, 117, 119, 121, 123, 125
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OFFSET

1,1


COMMENTS

In other words: numbers n such that the symmetric representation of sigma(n) has at least two parts with distinct number of cells.
For more information about the symmetric representation of sigma see A237270 and A237593.


LINKS



EXAMPLE

The symmetric representation of sigma(9) = 13 in the first quadrant looks like this:
y
.
._ _ _ _ _ 5
_ _ _ _ _
. _ _ 3
. _ 
. __ _ 5
.  
.  
.  
.  
. . . . . . . . _ . . x
.
There are three parts: 5 + 3 + 5 = 13, so 9 is in the sequence because the structure contains at least two parts of distinct size.


CROSSREFS

Cf. A000203, A196020, A235791, A236104, A237270, A237271, A237591, A237593, A239660, A239931A239934, A245092, A262626.


KEYWORD

nonn,more


AUTHOR



STATUS

approved



