Out of interest, how many 47s have you managed to clear?
I just wrote a whole load of calculations here and managed to forget (a) the push-pull 47/7s, and (b) when I added the 47/7s, I was counting some twice because I'd cleared them as 47/4s.
Let's try again.
All of the "original" 401-665 series apart from
(a) 405, 428, 430, 464, 486, 567, 574, 576, 579, 585, 609, 615, 621, 630, 637, 645, 649, 660, 661.
(b) not cleared as 47/4s
or 47/7s - 493 (701), 504 (702), 495 (704), 494 (706), 516 (708), 499 (709), 496 (710), 498 (711), 502 (715), 507 (716). Cleared the other 7 either as /4s or as /7s.
That, I think, is 234, unless someone knows different. 401-665 = 265, subtract 19 I didn't clear, subtract the 10 47/7s, and there was no 47548 or (ETH) 47601.
Also cleared - 47004, 47010, 47109, 47110, 47189, 47206, 47209, 47373.
So I *think* the total is 242.