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A004722 Delete all digits 3 from the terms of the sequence of nonnegative integers. 3
0, 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 14, 15, 16, 17, 18, 19, 20, 21, 22, 2, 24, 25, 26, 27, 28, 29, 0, 1, 2, 4, 5, 6, 7, 8, 9, 40, 41, 42, 4, 44, 45, 46, 47, 48, 49, 50, 51, 52, 5, 54, 55, 56, 57, 58, 59, 60, 61, 62, 6, 64, 65, 66, 67, 68, 69, 70, 71, 72, 7, 74, 75, 76 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Very similar to A004178, except that 3-repdigits (A002277) are completely removed from the sequence, whereas A004178 has 0s in their place. It is thus guaranteed that a(n) = n only when n < 3. - Alonso del Arte, Oct 18 2012

LINKS

Alonso del Arte, Table of n, a(n) for n = 0..9999

FORMULA

a(n) = n for -1 < n < 3;

a(n) = A004178(n + 1) for 2 < n < 32,

a(n) = A004178(n + 2) for 31 < n < 331,

a(n) = A004178(n + 3) for 330 < n < 3330,

a(n) = A004178(n + 4) for 3329 < n < 33329, etc. - Alonso del Arte, Oct 21 2012

MATHEMATICA

endAt = 103; Delete[Table[FromDigits[DeleteCases[IntegerDigits[n], 3]], {n, 0, endAt}], Table[{(10^expo - 1)/3 + 1}, {expo, Floor[Log[10, endAt]]}]] (* Alonso del Arte, Apr 29 2019 *)

PROG

(MATLAB) m=1;

for u=0:1000

    v=dec2base(u, 10)-'0'; v = v(v~=3);

    if length(v)>0; sol(m)=(str2num(strrep(num2str(v), ' ', ''))); m=m+1; end;

end

sol % Marius A. Burtea, May 07 2019

CROSSREFS

Sequence in context: A195994 A182815 A196252 * A094798 A326178 A162880

Adjacent sequences:  A004719 A004720 A004721 * A004723 A004724 A004725

KEYWORD

base,nonn

AUTHOR

N. J. A. Sloane

EXTENSIONS

Sean A. Irvine pointed out erroneous terms in b-file and confirmed correction, Apr 28 2019

Name edited by Felix Fröhlich, Apr 29 2019

STATUS

approved

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Last modified July 15 16:29 EDT 2019. Contains 325049 sequences. (Running on oeis4.)