How many such consonants are there in the letter series given below, each of which is immediately preceded by a vowel and immediately followed by a vowel? E R G H J K A L U V T B E V I N D P K J E K U J H G E T Y R E D A F G A V C A D W A T Y A R O K O D U

Refer to the following letter-number-symbol series and answer the question. Counting is to be done from left to right. All numbers are single-digit numbers. (Left) V 3 J @ L # E Z T 3 G 4 4 4 E 2 & 3 C Y $ G (Right) How many such letters are there each of which is immediately preceded by a number and also immediately followed by a symbol?

How many such pairs of digits are there in the number '2817296458' that have the same number of digits between them as in the natural number sequence, when counted in both forward and backward directions?