OFFSET
1,1
REFERENCES
Rodolfo Kurchan, Problem 15, Diversiones con NĂºmeros y Figuras, (2000).
EXAMPLE
a(4) = 8 because 8 in spanish is written "ocho" and has 4 letters.
MATHEMATICA
Select[Range@ 150, EvenQ@ StringLength@ StringDelete[IntegerName[#, {"Spanish"}], " "] &] (* Michael De Vlieger, Aug 21 2020 *)
CROSSREFS
KEYWORD
nonn,word
AUTHOR
Rodolfo Kurchan, Aug 04 2020
STATUS
approved