A171181 - OEIS

A171181

n followed by (n - sum of digits of n).

0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 8, 0, 9, 0, 10, 9, 11, 9, 12, 9, 13, 9, 14, 9, 15, 9, 16, 9, 17, 9, 18, 9, 19, 9, 20, 18, 21, 18, 22, 18, 23, 18, 24, 18, 25, 18, 26, 18, 27, 18, 28, 18, 29, 18, 30, 27, 31, 27, 32, 27, 33, 27, 34, 27, 35, 27, 36, 27, 37, 27, 38, 27, 39, 27

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OFFSET

0,5

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

FORMULA

If n is even, a(n) = n/2; if n is odd, a(n) = A066568(floor(n/2)). - Michel Marcus, Aug 14 2013

EXAMPLE

a(0) = 0, a(1) = 0 - 0 = 0.

a(2) = 1, a(3) = 1 - 1 = 0.

a(4) = 2, a(5) = 2 - 2 = 0.

a(6) = 3, a(7) = 3 - 3 = 0.

MATHEMATICA

Table[{n, n-Total[IntegerDigits[n]]}, {n, 0, 40}]//Flatten (* Harvey P. Dale, Nov 26 2016 *)

PROG

(PARI) a(n) = if (n % 2 == 0, n/2, nn = n\2; d = digits(nn); nn - sum(i=1, #d, d[i]); ); \\ Michel Marcus, Aug 14 2013

CROSSREFS

Interspersion of A001477 and A066568.

Sequence in context: A027656 A142150 A276457 * A364788 A309261 A326834

Adjacent sequences: A171178 A171179 A171180 * A171182 A171183 A171184

KEYWORD

easy,nonn,base

AUTHOR

Marcel Hetkowski Fabeny (marcelfabeny(AT)yahoo.com.br), Dec 04 2009

EXTENSIONS

Edited by N. J. A. Sloane, Dec 05 2009

STATUS

approved