340

340 = 2² x 5 x 17.

340 has two representations as a sum of two squares: 340 = 4² + 18² = 12² + 14².

340 is the number of integer partitions of 31 into distinct parts.

340 is a divisor of 69² - 1.

340 is a value of n for which n! + 1 is a prime.

The Airbus A340 is a long-range, four-engine wide-body commercial passenger jet airliner.

Source: What's Special About This Number?

130

130 = 2 x 5 x 13.

130 has two representations as a sum of two squares: 130 = 3² + 11² = 7² + 9².

130 is the smallest number with eight representations as a sum of four positive squares: 130 = 1² + 1² + 8² + 8² = 1² + 2² + 2² + 11² = 1² + 2² + 5² + 10² = 1² + 4² + 7² + 8² = 2² + 3² + 6² + 9² = 3² + 6² + 6² + 7² = 4² + 4² + 7² + 7² = 4² + 5² + 5² + 8².

130 is a cake number.

130 is the sum of the factorials of the first five terms of the Fibonacci sequence: 130 = 1! + 1! + 2! + 3! + 5!.

130 is the only number that is equal to the sum of the squares of its first four divisors: 130 = 1² + 2² + 5² + 10².

The Lockheed C-130 Hercules is a four-engine turboprop military transport aircraft.

Source: Number Gossip

126

126 = 2 x 3² x 7.

126 is the sixth pentatope number.

126 is 99 in base 13.

126 is a decagonal number and a pentagonal pyramidal number.

126 is the number of prime days in a non-leap year.

The Ferrari 126C was Ferrari's first attempt at turbo-charged Formula 1 car.

Source: Number Gossip

263

263 is a prime number.

263 is the largest known prime whose square is strobogrammatic; that is, it is the same number when rotated 180 degrees: 263² = 69169.

263 is the smallest prime number that is the sum of primes beginning and ending with the digit 1: 263 = 11 + 101 + 151. Note that the digit sum of each prime is prime and that the digit sum of 263 is a prime and begins and ends with the digit 1.

263 is the only prime with three distinct digits, where one is the product of the other two.

263 is the smallest prime formed be inserting a semiprime, 6, between the semiprime's factors, 2 and 3.

263 is a number that cannot be written as a sum of three squares.

Anne Frank (and her family) hid from the Nazis in an annex behind the house at 263 Prinsengracht 263 in Amsterdam.

Source: Prime Curios!

855

855 = 3² x 56 x 19.

855 is the sum of all the digits of all two-digit numbers.

855 is a number that cannot be written as a sum of three squares.

855 is a decagonal number. It is also a centered cube number.

855 is the smallest number that is the sum of five consecutive squares and two consecutive cubes: 855 = 11² + 12² + 13² + 14² + 15² = 7³ + 8³.

855 Newcombia is a asteroid discovered in 1916.

Source: Number Gossip

430

430 = 2 x 5 x 43.

430 is the number of necklaces possible with six beads, each being one of four colors.

430 is 656 in base 8.

430 is the number of primes less than 3000.

430 is a number such that its square is the sum of two or more consecutive squares.

The Ferrari F430 is a sports car produced from 2004 to 2009.

Source: What's Special About This Number?

6011

6011 is a prime number. Rotating 6011 by 180 degrees (turning it upside down) produces 1109, another prime.

6011 is a member of the Fibonacci-like sequence starting with 3 and 8.

6011 is a prime p such that the product its digits (excluding 0) is a divisor of p + 1.

6011² uses only the digits 1, 2, 3, and 6: 36132121.

60/11 equals 5.4545. . . , the exact time difference between consecutive overlaps of the hour and minute hands, which occurs 11 times every 60 minutes.

6011 is the postal code for Peppermint Grove, Western Australia, a suburb of Perth.

Source: Prime Curios!