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 Dart 17. The first Dart 17 used an undercarriage with a less extended wheel, fitted in a fairing but almost all later ones were fitted with a retracting undercarriage. The later Dart 15s used a similar metal and wood spar and had the root fillet, producing a net weight saving of 45 lb (21 kg) and a corresponding improvement in sink rate. Most Dart 15s retained the fixed wheel undercarriage to allow them to compete as Standard Class. Darts with retractable gear gained an R in their designation, e.g. 17R. The 1965 World Championships saw only modest success for the