OFFSET
0,2
COMMENTS
Despite 0 appearing in the evil numbers, it is excluded here for obvious reasons.
This sequence features a mixture of odious and evil numbers, demonstrated in terms such as a(5) and a(8), where 8100 is evil but 24768000 is odious. As such, this shows that despite doubling preserving evilness, this is untrue for all multipliers.
FORMULA
a(n) = Product_{k=2, n+1} A001969(k). - Michel Marcus, Sep 27 2020
EXAMPLE
a(3) = 3*5*6 = 90.
a(8) = 3*5*6*9*10*12*15*17 = 24786000.
MATHEMATICA
FoldList[Times, 1, Select[Range[40], EvenQ @ DigitCount[#, 2, 1] &]] (* Amiram Eldar, Sep 26 2020 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Jamie Robert Creasey, Sep 26 2020
STATUS
approved