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A018848 Strobogrammatic squares: the same upside down (probably finite). 4
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: A345603 A345862 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 May 14 01:40 EDT 2024. Contains 372528 sequences. (Running on oeis4.)