A018848 Strobogrammatic squares: the same upside down (probably finite).

0, 1, 6889, 69169, 109181601

Offset

1,3

Comments

Square numbers which when written down and rotated by 180 degrees are unchanged.

Subsequence of squares in A000787. - Derek Orr and Michel Marcus, Aug 04 2014

Links

Table of n, a(n) for n=1..5.

Crossrefs

Cf. A000787, A018849 (similar sequence).

Sequence in context: A345603 A345862 A062678 * A031581 A031761 A184791

Adjacent sequences: A018845 A018846 A018847 * A018849 A018850 A018851

Keyword

nonn,base

Author

David W. Wilson

Status

approved