# 1783

In 1783, a prime year, William Herschel discovered the solar motion (in relation to the stars of the galaxy). [Gevisier]

Leonhard Euler, the most prolific mathematician in history, died in 1783. [Beisel]

1783 is the largest prime factor of any number among the smallest group of sociable numbers (12496, 14288, 15472, 14536 and 14264).

(1783, 8317) is the first of only two pairs of primes concatenated from two complementary double-digit primes (17, 83). The 2nd pair is (2971, 7129). [Loungrides]

The year the first untethered manned hot air balloon flight was flown. [Gaydos]

The smallest number n for which the total number of digits in the first n Cyclops primes is a Cyclops prime (11093). [Gaydos]

The sum of the first 1783 Honaker primes, i.e., (131 + 263 + 457 + 1039 + ... + 541217 + 541237), is a Cyclops prime. [Bajpai]