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.

990100, 99009900990100, 9900990099009900990100, 990099009900990099009900990100, 99009900990099009900990099009900990100, 9900990099009900990099009900990099009900990100, 990099009900990099009900990099009900990099009900990100

Offset

1,1

Links

Table of n, a(n) for n=1..7.

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

Adjacent sequences: A055615 A055616 A055617 * A055619 A055620 A055621

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