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A117570
Numbers of the form k * (sum of digits of k) listed sorted with multiplicity.
2
0, 1, 4, 9, 10, 16, 22, 25, 36, 36, 40, 49, 52, 63, 64, 70, 81, 88, 90, 90, 100, 112, 115, 124, 136, 144, 160, 160, 162, 175, 190, 198, 202, 205, 208, 220, 238, 243, 250, 252, 280, 280, 301, 306, 306, 319, 324, 333, 352, 360, 360, 364, 370, 400, 405, 412, 418, 424
OFFSET
1,3
LINKS
Ernesto Estrada, Puri Pereira-Ramos, Spatial 'Artistic' Networks: From Deconstructing Integer-Functions to Visual Arts, Complexity, Vol. 2018 (2018), Article ID 9893867.
EXAMPLE
2008 is a term since 2008 = 251*(2+5+1).
MATHEMATICA
With[{nn = 400}, TakeWhile[#, # <= nn &] &@ Union@ Array[# Total@ IntegerDigits[#] &, nn + 1, 0]] (* Michael De Vlieger, Apr 19 2018 *)
CROSSREFS
Sorted terms of A057147.
Terms without duplicates are given by A337816.
Sequence in context: A340784 A260963 A243188 * A337816 A272266 A155566
KEYWORD
nonn,base
AUTHOR
Ernesto Estrada (estrada66(AT)yahoo.com), Jan 02 2008
STATUS
approved