A275625 - OEIS

A275625

Numerator of Sum_{k=1..n} 0.k.

1, 3, 3, 1, 3, 21, 14, 18, 9, 23, 471, 483, 124, 51, 21, 541, 279, 144, 119, 123, 159, 329, 681, 141, 73, 189, 783, 811, 42, 87, 901, 933, 483, 10, 207, 1071, 277, 573, 237, 49, 633, 327, 1351, 279, 72, 743, 1533, 1581, 163, 84, 1731, 1783, 459, 189, 389, 2001, 1029, 529, 87, 447, 574, 1179

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

OFFSET

1,2

COMMENTS

Here 0.k means the decimal fraction obtained by writing k after the decimal point, e.g. 0.12 = 12/100 = 3/25.

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..20000

EXAMPLE

The first few values of Sum_{k=1..n} 0.k are:

1/10, 3/10, 3/5, 1, 3/2, 21/10, 14/5, 18/5, 9/2, 23/5, 471/100, 483/100, 124/25, 51/10, 21/4, 541/100, 279/50, 144/25, 119/20, 123/20, 159/25, 329/50, 681/100, 141/20, 73/10, 189/25, ...

MAPLE

b:= proc(n) option remember;

n/10^length(n)+`if`(n<2, 0, b(n-1))

end:

a:= n-> numer(b(n)):

seq(a(n), n=1..100); # Alois P. Heinz, Aug 16 2016

CROSSREFS

Cf. A275626, A054464, A275623, A275624.

Sequence in context: A120919 A032240 A366556 * A331901 A306148 A106836

Adjacent sequences: A275622 A275623 A275624 * A275626 A275627 A275628

KEYWORD

nonn,base,look,frac

AUTHOR

N. J. A. Sloane, Aug 07 2016

STATUS

approved