The Science Times section of the New York Times, Tuesday, May 23, 2023, had an article on Sloane's Online Encyclopedia of Integer Sequences. A sidebar had four sequences for the reader to identify. Here's your chance to do so; identify the next in sequence:
- 0, 1, 8, 11, 69, 88, 96, 101, ...
- 1, 11, 21, 1211, 111221, 312211, ...
- 5, 8, 12, 18, 24, 30, 36, 42, ...
- 14, 18, 23, 28, 34, 42, 50, ...
Of course it would be no fun looking up the answers in the OEIS (or the NYT).
"Upside down numbers"
Numbers that read the same way when rotated to be upside down - 180 degree rotational symmetry.
Part A
