A249621 Squares that remain squares when prepended with 1 and appended with 25 in base 10.

81390384100, 1406394753724900, 35835016467147821056, 40988174007950912656, 50380850763055363600, 4792217024781750114460900, 284966691269408660851864225156, 14530422026948661087028976772730756, 30683674238436575795584244321722756

Offset

1,1

Comments

Conjecture: all the numbers in the sequence end in either 00 or 56.

Links

Chai Wah Wu, Table of n, a(n) for n = 1..27

Formula

Squares of A249633.

Example

81390384100 = 285290^2 and 18139038410025 = 4258995^2.

Crossrefs

Cf. A249633.

Sequence in context: A022252 A034653 A289116 * A227280 A172548 A172611

Adjacent sequences: A249618 A249619 A249620 * A249622 A249623 A249624

Keyword

nonn,base

Author

Chai Wah Wu, Nov 02 2014

Status

approved