STATUS
proposed
approved
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Revision History for A340164
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STATUS
editing
proposed
COMMENTS
A rotationally ambigrammatic number (A045574) is one that can be rotated by 180 degrees resulting in a readable, most often new number. Such numbers, by definition , can only contain the digits; 0, 1, 6, 8, 9.
If the number once rotated happens to be the same number (ege.g. , 6889) this it is a strobogrammatic number. Those present here are the terms of A018848.
Numbers such as 100, which is a square with trailing zero's zeros, have been excluded. Such numbers rotated by 180 degrees would be written with leading zeros. Typically this is not the way we write numbers.
STATUS
proposed
editing
STATUS
editing
proposed
COMMENTS
If the number once rotated happens to be the same number (eg. 6889) this is a strobogrammatic number (. Those present here are A018848); a subset of ambigrammatic.
STATUS
proposed
editing
STATUS
editing
proposed
COMMENTS
This sequence is infinite as it contains (10^k + 3)^2 and (3*10^k + 1)^2 for any k >= 0 (note also that A004086((10^k + 3)^2 turned upside down is ) = (3*10^k + 1)^2 and vice versa when k > 0). - Rémy Sigrist, Dec 30 2020
STATUS
proposed
editing
STATUS
editing
proposed
COMMENTS
This sequence is infinite as it contains (10^k + 3)^2 and (3*10^k + 1)^2 for any k >= 0 (note also that (10^k + 3)^2 turned upside down is (3*10^k + 1)^2 and vce vice versa when k > 0). - Rémy Sigrist, Dec 30 2020
COMMENTS
This sequence is infinite as it contains (10^k + 3)^2 and (3*10^k + 1)^2 for any k >= 0 (note also that A004086((10^k + 3)^2) = turned upside down is (3*10^k + 1)^2 and vce versa when k > 0). - Rémy Sigrist, Dec 30 2020