OFFSET
1,1
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
Eric Weisstein's World of Mathematics, Vigesimal
Wikipedia, Vigesimal
EXAMPLE
112 = 5*20^1 + 12*20^0 = '5C', therefore 112 is a term.
MATHEMATICA
Select[Range[150], Max[IntegerDigits[#, 20]]>9&] (* Harvey P. Dale, Mar 27 2021 *)
PROG
(Haskell)
import Data.List (unfoldr)
a102492 n = a102492_list !! (n-1)
a102492_list = filter (any (> 9) . unfoldr
(\x -> if x == 0 then Nothing else Just $ swap $ divMod x 20)) [0..]
-- Reinhard Zumkeller, Jun 27 2013
CROSSREFS
KEYWORD
nonn,base,changed
AUTHOR
Reinhard Zumkeller, Jan 12 2005
STATUS
approved