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A055618
a(n) = A*10^(4*n-1) + B with A = 990*(10^(4*n)-1)/9999 and B = 990000*(10^(4*n-4)-1)/9999 + 100.
2
990100, 99009900990100, 9900990099009900990100, 990099009900990099009900990100, 99009900990099009900990099009900990100, 9900990099009900990099009900990099009900990100, 990099009900990099009900990099009900990099009900990100
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
Subset of A055616.
Sequence in context: A154674 A236034 A055617 * A341551 A216276 A252903
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