OFFSET
1,1
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
FORMULA
a(n+20)=a(n)+200. - Robert Israel, May 20 2019
MAPLE
seq(seq(seq(seq(10^3*a+10^2*b+10*c+d, d=[1, 3, 7, 9]), c=1..9, 2), b=1..9, 2), a=0..1); # Robert Israel, May 20 2019
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Jonathan Vos Post, Jan 02 2008
STATUS
approved