@engineers_feed I see 47, 28 and 7 as 1st, 2nd and 3rd. 1st is 3rd squared minus 2 and 2nd is 4 times 3rd so you know 7 and 4 are multiples of 7 so you get straight away 77 then take 2 off to get 75 which you confirm by seeing a 7 and an 8 and that the numbers in front add to one less than 7