Question

1961 is seen as 1961
1001 is seen as 1001
2002 is seen as 2002
1881 is seen as 1881


what is the logic of arrangement of the above numbers.​

Answer 1

Answer:

A strobogrammatic number is a number whose numeral is rotationally symmetric, so that it appears the same when rotated 180 degrees. In other words, the numeral looks the same right-side up and upside down (e.g., 69, 96, 1001).[1] A strobogrammatic prime is a strobogrammatic number that is also a prime number, i.e., a number that is only divisible by one and itself (e.g., 11).[2] It is a type of ambigram, words and numbers that retain their meaning when viewed from a different perspective, such as palindromes.[3]