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A082666 a(1) = 0, a(n) = if n=prime(k) then k else Sum(a(d): d divides n and d<n). 0
0, 1, 2, 1, 3, 3, 4, 2, 2, 4, 5, 7, 6, 5, 5, 4, 7, 8, 8, 9, 6, 6, 9, 16, 3, 7, 4, 11, 10, 18, 11, 8, 7, 8, 7, 2, 4, 12, 9, 8, 20, 13, 21, 14, 13, 12, 10, 15, 36, 4, 11, 9, 15, 16, 20, 8, 24, 10, 11, 17, 53, 18, 12, 14, 16, 9, 24, 19, 17, 11, 24, 20, 66, 21, 13, 13, 19, 9, 27, 22, 44, 8, 14 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

n>1: a(n) = A049084(n) + Sum(a(d): d divides n and d<n).

LINKS

Table of n, a(n) for n=1..83.

EXAMPLE

a(20) = a(1)+a(2)+a(4)+a(5)+a(10) =

0+1+(a(1)+a(2))+3+(a(1)+a(2)+a(5)) = 0+1+(0+1)+3+(0+1+3) = 1+1+3+4 = 9.

CROSSREFS

Sequence in context: A263275 A308057 A097686 * A057938 A144623 A218975

Adjacent sequences:  A082663 A082664 A082665 * A082667 A082668 A082669

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, May 18 2003

STATUS

approved

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Last modified October 13 20:38 EDT 2019. Contains 327981 sequences. (Running on oeis4.)