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A018848 Strobogrammatic squares: the same upside down (probably finite). 2
0, 1, 6889, 69169, 109181601 (list; graph; refs; listen; history; text; internal format)
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: A154086 A064351 A062678 * A031581 A031761 A184791

Adjacent sequences:  A018845 A018846 A018847 * A018849 A018850 A018851

KEYWORD

nonn,base

AUTHOR

David W. Wilson

STATUS

approved

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Last modified October 22 03:04 EDT 2019. Contains 328315 sequences. (Running on oeis4.)