A number is Esthetic if, in any base from base2 up to base10, the absolute difference between every pair of its adjacent digits is constantly equal to 1.
num = 441 (base10)
# Adjacent pairs of digits:
# |4, 4|, |4, 1|
# The absolute difference is not constant
# 441 is not Esthetic in base10
441 in base4 = 12321
# Adjacent pairs of digits:
# |1, 2|, |2, 3|, |3, 2|, |2, 1|
# The absolute difference is constant and is equal to 1
# 441 is Esthetic in base4
Given a positive integer num, implement a function that returns a list containing the bases (as integers from 2 up to 10) in which num results to be Esthetic, or a string "Anti-Esthetic" if no base makes num Esthetic.
esthetic(10) ➞ [2, 3, 8, 10]
# 10 in base2 = 1010
# 10 in base3 = 101
# 10 in base8 = 12
# 10 in base10 = 10
esthetic(23) ➞ [3, 5, 7, 10]
# 23 in base3 = 212
# 23 in base5 = 43
# 23 in base7 = 32
# 23 in base10 = 23
esthetic(666) ➞ [8]
# 666 in base8 = 1232
N/A