40 The Green, Southgate
40 The Green is a grade II listed building on The Green, Southgate, London. The house dates from the early nineteenth century with later alterations. It bears a local blue plaque that reads, "In 1881 this house became the first seat of local government in Southgate",40, THE GREEN.
Historic England. Retrieved 18 April 2016. referring to the separation of Southgate from Edmonton in that year.

40 And 41 The Green, Southgate
4 (four) is a number, numeral and digit. It is the natural number following 3 and preceding 5. It is the smallest semiprime and composite number, and is considered unlucky in many East Asian cultures. In mathematics Four is the smallest composite number, its proper divisors being and . Four is the sum and product of two with itself: 2 + 2 = 4 = 2 x 2, the only number b such that a + a = b = a x a, which also makes four the smallest squared prime number p^. In Knuth's up-arrow notation, , and so forth, for any number of up arrows. By consequence, four is the only square one more than a prime number, specifically three. The sum of the first four prime numbers two + three + five + seven is the only sum of four consecutive prime numbers that yields an odd prime number, seventeen, which is the fourth super-prime. Four lies between the first proper pair of twin primes, three and five, which are the first two Fermat primes, like seventeen, which is the third. On the other hand ...
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