The smallest square with exactly n circular loops (or holes) in its decimal expansion (A064532).

A359245

The smallest square with exactly n circular loops (or holes) in its decimal expansion (A064532).

Terms

    a(0) =1a(1) =0a(2) =81a(3) =289a(4) =1089a(5) =8836a(6) =6889a(7) =80089a(8) =688900a(9) =1868689a(10) =8508889a(11) =29888089a(12) =288898009a(13) =983888689a(14) =3808988089a(15) =8680089889a(16) =86908808809a(17) =488088068689a(18) =878686888689

External references