300 (number) and strictly non-palindromic number. 361 = 19, centered triangular number, centered octagonal number, centered decagonal number, member of the Mian–Chowla sequence; also the number of positions on a standard 19 x 19 Go board. The Bahá'í calendar is based on 19 months of 19 days each. 362 = 2 × 181, Mertens function returns 0, nontotient, noncototient. 363 = 3 × 11, sum of nine consecutive primes (23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59), Mertens function returns 0, perfect totient number. 364 = 2 × 7 × 13, tetrahedral number,
Slingsby Dart Darts: a Dart 15 finished 5th in the Standard Class event and the Dart 17 came 7th in the Open Class. 82 complete Darts of both spans are known to have been built. Overall, rather more of the large span Darts were made. One had removable wing tips, so it could fly in either class. Two special Dart 15s, designated Dart 15W were produced for the Standard Class at the 1968 World Championships with wings using a new aerofoil section and a revised canopy. After the competition, in which they were not highly placed, their wings were extended to 17