A249121 - OEIS

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A249121

a(n) = n - (sum of digits of n) - (product of digits of n).

2

0, -1, -2, -3, -4, -5, -6, -7, -8, -9, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0, 27, 24, 21, 18, 15, 12, 9, 6, 3, 0, 36, 32, 28, 24, 20, 16, 12, 8, 4, 0, 45, 40, 35, 30, 25, 20, 15, 10, 5, 0, 54, 48, 42, 36, 30, 24, 18, 12, 6, 0, 63, 56, 49, 42, 35, 28, 21, 14, 7, 0, 72, 64, 56

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

In the graph, the upper bound is the line:

a(10*m) = 9m: a(10) = 9, a(20) = 18, a(30) = 27,...

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..10000

Zak Seidov, Color graph with line connecting the consecutive points.

FORMULA

a(n) = n - A007953(n) - A007954(n) = A001477(n) - A061762(n).

MAPLE

a:= n-> (l-> n-add(i, i=l)-mul(i, i=l))(convert(n, base, 10)):

seq(a(n), n=0..120); # Alois P. Heinz, Oct 22 2014

MATHEMATICA

Table[id = IntegerDigits[n]; n - (Plus @@ id) - (Times @@ id), {n, 0, 200}]

PROG

(PARI) a(n)=d=digits(n); if(!n, return(0)); n-sumdigits(n)-prod(i=1, #d, d[i])

vector(100, n, a(n-1)) \\ Derek Orr, Oct 21 2014

CROSSREFS

Cf. A001477, A007953, A007954, A061762.

Sequence in context: A028903 A081599 A289642 * A289410 A225673 A358098

Adjacent sequences: A249118 A249119 A249120 * A249122 A249123 A249124

KEYWORD

sign,base,look

AUTHOR

Zak Seidov, Oct 21 2014

STATUS

approved