A068834 Square such that the next three squares also having a square digit sum.

81, 100, 121, 144, 400, 10000, 10201, 10404, 12100, 40000, 1000000, 1002001, 1004004, 1020100, 1172889, 1210000, 1232100, 2604996, 4000000, 4297329, 4485924, 6185169, 11048976, 11108889, 12916836, 14584761, 16353936, 23040000

Offset

1,1

Links

Table of n, a(n) for n=1..28.

Example

a(7) = 81 as the sum of the digits of 7 consecutive squares 81,100,121,144,169,196 and 225 is a square.

Crossrefs

Cf. A068833.

Sequence in context: A243260 A335066 A179444 * A067521 A117686 A104113

Adjacent sequences: A068831 A068832 A068833 * A068835 A068836 A068837

Keyword

base,hard,nonn

Author

Amarnath Murthy, Mar 09 2002

Extensions

More terms from Sascha Kurz, Mar 26 2002

Status

approved