Interstates and Integers

[sparker]

Looking at the recent spate of new 2di (and a 1di for good measure!) Interstate commissioning in recent years, something occurred to me:  All the new -- and not previously deployed -- numbers commissioned since the turn of the century (6 so far) have been permutations of only 3 of the 10 available integers:  1, 2, and 4.  I'm counting both those currently numbered in the field AND those with congressional commissioning but currently without signage save some "future corridor" indications.  Here's the list:

(2004):  I-22,  (2012):  I-11,  (2013): I-2,  (2014): I-41,  (2015): I-14,  (2016): I-42.   

Nothing earthshaking -- just somewhat interesting!  Since 4, 12, 24, and 44 are already in use, the only other 1/2/4 integral permutations left are 1 and 21.  Something tells me we're pretty much done with this particular set!

[CNGL-Leudimin]

The Southern I-87 begs to differ. It doesn't contain any of 1, 2 or 4.

[sparker]

Looking at the recent spate of new 2di (and a 1di for good measure!) Interstate commissioning in recent years, something occurred to me:  All the new -- and not previously deployed -- numbers commissioned since the turn of the century (6 so far) have been permutations of only 3 of the 10 available integers:  1, 2, and 4.  I'm counting both those currently numbered in the field AND those with congressional commissioning but currently without signage save some "future corridor" indications.  Here's the list:

(2004):  I-22,  (2012):  I-11,  (2013): I-2,  (2014): I-41,  (2015): I-14,  (2016): I-42.   

Nothing earthshaking -- just somewhat interesting!  Since 4, 12, 24, and 44 are already in use, the only other 1/2/4 integral permutations left are 1 and 21.  Something tells me we're pretty much done with this particular set!

The Southern I-87 begs to differ. It doesn't contain any of 1, 2 or 4.

That's why the disclaimer "not previously deployed" -- as a number in the field -- is included in the OP.  I am referring to new, freshly-minted 1-or-2di designations, not 2nd sections of a previously used number. 

[roadfro]

An "integer" is any number that can be written without a decimal/fractional component (whole number). "1" is an integer, "50" is an integer, "-6" is an integer. Thus, there are way more than ten available integers.

It is more correct to say that the numbers have been permutations of three of the ten *digits*...

[sparker]

You are indeed correct, sir!  I probably dozed off during that math class (we former liberal-arts majors tended to do that sort of thing!), and have a scrambled idea of the specific definitions.  You as the mod of record therefore have my blessing to retitle the thread "Interstates and Digits" -- although it won't be alliterative any more!     SP