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 Sellers, Sep 28 2001

a(6) corrected by Sean A. Irvine, Mar 29 2022

Status

approved