OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
EXAMPLE
a(6)= 1+3+5+7+9+1 = 26.
MATHEMATICA
Module[{nn=20, codd}, codd=Flatten[IntegerDigits/@(2Range[0, nn]+1)]; Accumulate[ codd]] (* Harvey P. Dale, Jul 09 2021 *)
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Amarnath Murthy, Jan 08 2002
STATUS
approved