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What is rule 3?

tubeguru wrote:What is rule 3?

Please see discussion thread.

I'll repeat 771 so we know there's a valid post:

Dewey Decimal Classification 771 is for techniques, equipment and materials in photography and computer art.

Thanks. Back to normal hopefully:

Starting with the A1, there are 772 consecutive A-road numbers that have at some time been allocated in Great Britain. [Incidentally, I think I've walked most of the A772 as well - it's about three miles long and passes the Edinburgh Butterfly and Insect World at Lasswade, south of Edinburgh.]

The Tetranacci sequence is similar to the Fibonacci sequence, but adds the four previous numbers to get the next number. The sequence starts:

0, 0, 0, 1, 1, 2, 4, 8, 15, 29, 56, 108, 208, 401, 773 ...

774 kHz is a supplementary frequency used by BBC Radio 4 in Enniskillen and Plymouth.

The reference voltage for 0dBu is 0.775 Volts. (It's the voltage which delivers 1 mW of power in a 600 ohm resistor.)

In the film Bruce Almighty, God contacts Bruce, via pager, using an actual phone number rather than a number in the standard US fictional 555 telephone exchange: 776-2323. The number was later changed to 555-0123 for TV and DVD release.

The number of immortal/perfect (spiritual) man is 777, (compared to the number of mortal/imperfect man - 666.)

778 is the number of ways a 5×1 rectangle can be surrounded by 5×1 rectangles. [Source: http://www2.stetson.edu/~efriedma/numbers.html]

Pop to Scotland's easternmost point, and you'll be in Peterhead. Its STD code ends 779.

780 is the 20th hexagonal number - the number of points in a hexagon with 20 regularly spaced points on a side.

781 in Dewey Decimal Classification denotes general musical principles and forms.

A782 is the start of the longest run of unallocated A-road numbers below 1200 - eighteen in total.