[seqfan] a(n) + (next digit) = even or odd

Eric Angelini Eric.Angelini at kntv.be
Sun Nov 16 16:54:40 CET 2014

Hello SeqFans,
I guess this is the lexico-first permutation P
of the integers > 0 where a(n) + (the next digit of P)
is even:
P = 1,3,5,7,9,10,2,4,6,8,20,21,11,12,22,23,13,14,24,25,15,16,26,27,17,18,28,29,19,30,40,41,31,32,...

Similarily, Q should be the lexico-first
permutation of the integers > 0 where
a(n) + (next digit of Q) is odd:


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