OFFSET
1,1
EXAMPLE
a(2) = (990*(10^8-1)/9999)*10^7 + 990000*(10^4-1)/9999 + 100 = 99009900990100 = 9900990^2 + 0990100^2.
MAPLE
for n from 1 to 15 do printf(`%d, `, (990*(10^(4*n)-1)/9999)*10^(4*n-1)+990000*(10^(4*n-4)-1)/9999+100 ) od:
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
Ulrich Schimke (ulrschimke(AT)aol.com)
EXTENSIONS
One more term from James A. Sellers, Sep 28 2001
a(6) corrected by Sean A. Irvine, Mar 29 2022
STATUS
approved