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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

%I

%S 990100,99009900990100,9900990099009900990100,

%T 990099009900990099009900990100,

%U 99009900990099009900990099009900990100,990099009900990099009900990099009900990,990099009900990099009900990099009900990099009900990100

%N 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.

%e a(2) = (990*(10^8-1)/9999)*10^7+990000*(10^4-1)/9999+100 = 99009900990100 = 9900990^2+0990100^2

%p 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:

%Y Subset of A055616.

%K nonn,base,easy

%O 1,1

%A Ulrich Schimke (ulrschimke(AT)aol.com)

%E One more term from _James A. Sellers_, Sep 28 2001

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Last modified November 29 12:24 EST 2021. Contains 349416 sequences. (Running on oeis4.)