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A117241 Numbers divisible by the sum of k times the k-th digit. 1
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 20, 30, 38, 40, 50, 57, 60, 70, 76, 80, 90, 95, 100, 104, 120, 190, 200, 207, 208, 231, 240, 252, 300, 310, 360, 380, 400, 403, 414, 430, 432, 462, 465, 480, 500, 506, 528, 570, 600, 620, 625, 629, 693, 700, 702, 714, 754, 760, 800, 805, 806 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
95 is in the sequence because 1*9 + 2*5 = 19 and 95 is divisible by 19.
1232 is in the sequence because 1*1 + 2*2 + 3*3 + 4*2 = 22 and 1232 is divisible by 22.
MATHEMATICA
Select[Range[1000], Divisible[#, Plus @@ ((d = IntegerDigits[#]) * Range[Length[d]])] &] (* Amiram Eldar, Feb 08 2021 *)
CROSSREFS
Cf. A156207.
Sequence in context: A343131 A119246 A280657 * A108191 A108193 A089583
KEYWORD
base,nonn
AUTHOR
Luc Stevens (lms022(AT)yahoo.com), Apr 22 2006
EXTENSIONS
Missing terms inserted by Amiram Eldar, Feb 08 2021
STATUS
approved

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Last modified March 19 04:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)