

A243971


Numbers n that cannot be obtained as a partial sum of the divisors (taken in descending order, from m down to 1) of any m < n.


1



1, 2, 5, 10, 16, 19, 26, 29, 34, 37, 43, 46, 58, 64, 65, 67, 73, 82, 86, 94, 101, 109, 122, 130, 134, 142, 145, 146, 149, 157, 163, 190, 193, 197, 199, 202, 206, 211, 229, 257, 262, 281, 283, 290, 298, 302, 310, 334, 337, 347, 349, 367, 401, 409, 421, 430
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OFFSET

1,2


COMMENTS



LINKS



EXAMPLE

From n=1 to 4, these partial sums are: 1; 2, 3; 3, 4; 4, 6, 7. So it is not possible to obtain 5 with any partial sum of divisors of numbers that are less than 5. And indeed A243970(5) is equal to 5. Hence 5 is in this sequence.


MATHEMATICA

Module[{nn = 432, s}, s = Array[Function[d, Array[Total@ Take[d, #] &, Length@ d]]@ Divisors@ # &, nn  1]; Select[Range@ nn, ! MemberQ[Flatten@ Take[s, #  1], #] &]] (* Michael De Vlieger, Jul 22 2017 *)


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



