From your 35 

perl -e'print(($_^$_>>1).$/)for(0..pop)' 15
     12345678901234567890123456789012345

[download]

I shave 6 off 

perl -le'print$_^$_>>1 for 0..pop' 15
     12345678901234567890123456789

[download]

3 more if 5.10+ 

perl -E'say$_^$_>>1 for 0..pop' 15
     12345678901234567890123456

[download]

In reply to Re: Decimal Gray Code in 31 chars by ikegami
in thread Decimal Gray Code in 31 chars by Oromis92

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