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Australia
Since dive used 405 for two posts, I need to skip over 406 to get my post wearing its correct number, 407.
So I can have 408 which is 2 x 2 x 2 x 3 x 17.
Linkenheim
409...the 80th prime number
.410 is a small-bore shotgun
411 is a telephone number for local directory assistance in Canada and the United States.
412 was a leap year.
@Kewpie said412 was a leap year.
414 is a palindrome
415 is the product of two primes, 83 and 5.
416 is (2) squared followed by (2×2) squared.Or 4 followed by 4 squared.
Subclass 417 is the visa to get if you want to backpack in Australia.
"418 I'm a teapot" is an HTTP error code
419 another prime (not optimus however)
420 Bertholda is a very large asteroid.