A167542 Natural numbers, swapped in pairs, with decimal digits reversed.

2, 1, 4, 3, 6, 5, 8, 7, 1, 9, 21, 11, 41, 31, 61, 51, 81, 71, 2, 91, 22, 12, 42, 32, 62, 52, 82, 72, 3, 92, 23, 13, 43, 33, 63, 53, 83, 73, 4, 93, 24, 14, 44, 34, 64, 54, 84, 74, 5, 94, 25, 15, 45, 35, 65, 55, 85, 75, 6, 95, 26, 16, 46, 36, 66, 56, 86, 76, 7, 96, 27, 17, 47, 37, 67

Offset: 1

Author

Giovanni Teofilatto, Nov 06 2009

Keywords

• nonn
• base

Programs

Maple

read("transforms") ; A014681 := proc(n) option remember; if n <= 3 then op(n+1,[0,2,1,4]) ; else procname(n-1)+procname(n-2)-procname(n-3) ; end if; end proc: A167542 := proc(n) digrev(A014681(n)) ; end proc: seq(A167542(n),n=1..120) ; # R. J. Mathar, Jan 30 2010

Extensions

All terms from a(18) on corrected by R. J. Mathar, Jan 30 2010