A248555 a(n) is the concatenation of 3n-2, 3n and 3n-1.

132, 465, 798, 101211, 131514, 161817, 192120, 222423, 252726, 283029, 313332, 343635, 373938, 404241, 434544, 464847, 495150, 525453, 555756, 586059, 616362, 646665, 676968, 707271, 737574, 767877, 798180, 828483, 858786, 889089, 919392

Offset: 1

Author

Charles Duvall, Oct 08 2014

Keywords

• nonn
• base
• less

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Programs

Maple

read("transforms") ;
A248555 := proc(n)
    digcatL([3*n-2,3*n,3*n-1]) ;
end proc:
seq(A248555(n),n=1..70) ;  # R. J. Mathar, Jan 22 2015

Mathematica

FromDigits[Flatten[IntegerDigits/@{#-2,#,#-1}]]&/@(3*Range[40]) (* Harvey P. Dale, Jul 01 2021 *)