A277964 Numbers whose largest decimal digit is 2.

2, 12, 20, 21, 22, 102, 112, 120, 121, 122, 200, 201, 202, 210, 211, 212, 220, 221, 222, 1002, 1012, 1020, 1021, 1022, 1102, 1112, 1120, 1121, 1122, 1200, 1201, 1202, 1210, 1211, 1212, 1220, 1221, 1222, 2000, 2001, 2002, 2010, 2011, 2012, 2020, 2021, 2022

Offset

1,1

Comments

Number of terms less than 10^n is 3^n-2^n, i.e., A001047(n). - Chai Wah Wu, Nov 06 2016 [extended by Felix Fröhlich, Nov 07 2016]

Numbers n such that A054055(n) = 2. - Felix Fröhlich, Nov 07 2016

Links

Alois P. Heinz, Table of n, a(n) for n = 1..10000 (first 1000 terms from Colin Barker)

Maple

N:= 6: # to get all terms of at most N digits
R:= 2: B:= {1}: C:= {1, 2}:
for  d from 2 to N do B:= map(t -> (10*t, 10*t+1), B);
C:= map(t -> (10*t, 10*t+1, 10*t+2), C);
R:= R, op(sort(convert(C minus B, list)))
od:
R; # Robert Israel, Nov 07 2016

Mathematica

A277964Q = Max[IntegerDigits[#]] == 2 &; Select[Range[2000], A277964Q] (* JungHwan Min, Nov 06 2016 *)

Prog

(PARI) L=List(); for(n=1, 10000, if(vecmax(digits(n))==2, listput(L, n))); Vec(L)
(GAP) Filtered([1..2100], n->Maximum(ListOfDigits(n))=2); # Muniru A Asiru, Mar 01 2019

Crossrefs

Cf. A007088, A277965, A277966.

Sequence in context: A303880 A174977 A011532 * A043497 A051804 A352262

Adjacent sequences: A277961 A277962 A277963 * A277965 A277966 A277967

Keyword

nonn,base

Author

Colin Barker, Nov 06 2016

Status

approved