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

1,1

Links

Table of n, a(n) for n=1..75.

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

Crossrefs

Sequence in context: A355678 A355679 A147965 * A167419 A114285 A014681

Adjacent sequences: A167539 A167540 A167541 * A167543 A167544 A167545

Keyword

nonn,base

Author

Giovanni Teofilatto, Nov 06 2009

Extensions

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

Status

approved