[seqfan] Odd/even: integers and digits alternate

Eric Angelini Eric.Angelini at kntv.be
Sat Oct 6 08:57:14 CEST 2012

Hello SeqFans,
- an odd integer must be followed
by an even one;
- an even integer must be followed
by an odd one;
- the same with the sequence's 
- start with a(1) = 1
- take always the smallest available
integer not already present in the
sequence and not leading to a
contradiction -- voilà!

S = 1,2,3,4,5,6,7,8,9,210,101,212,103,214,105,216,107,218,109,230,121,232,123,234,125,236,127,238,129,250,141,...

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