340 = 2 2 x 5 x 17. 340 has two representations as a sum of two squares: 340 = 4 2 + 18 2 = 12 2 + 14 2 . 340 is the number of integer ...

130 = 2 x 5 x 13. 130 has two representations as a sum of two squares: 130 = 3 2 + 11 2 = 7 2 + 9 2 . 130 is the smallest number with eig...

126 = 2 x 3 2 x 7. 126 is the sixth pentatope number . 126 is 99 in base 13. 126 is a decagonal number and a pentagonal pyramidal number ...

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 deg...

855 = 3 2 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 sq...

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 ...

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

600 = 2 3 x 3 x 5 2 . 600 is the product of two consecutive integers, so it is a pronic number : 600 = 24 x 25. 600 and its reverse, 6, are...

298 = 2 x 149. 298 has a representation as a sum of two squares: 298 = 3 2 + 17 2 . 298 = (2 2 + 9 2 + 8 2 ) + (2 2 + 9 2 + 8 2 ). 298...

335 = 5 x 67. It is divisible by the number of primes below it (67). 335 is a number that cannot be written as a sum of three squares. 335 i...

457 is a prime number. 457 has a representation as a sum of two squares: 457 = 4 2 + 21 2 . 457 is the hypotenuse of a primitive Pythagorea...

599 is a prime number. 599 and 601 form a twin prime pair. 599 is a number that cannot be written as a sum of three squares. 599 is a divi...

445 = 5 x 89. 445 has two representations as a sum of two squares: 445 = 2 2 + 21 2 = 11 2 + 18 2 . 445 is the hypotenuse of two primitiv...

1237 is a prime number. 1237 has a representation as a sum of two squares: 1237 = 9 2 + 37 2 . 1237 is the hypotenuse of a primitive Pythag...

179 is a prime number. 179 is a Sophie Germain prime because 2 x 179 + 1 = 359 , a prime. 179 and 181 form a twin prime pair. 179 = (17 x ...

686 = 2 x 7 3 . 686 is a divisor of 19 6 - 1. 686 is the number of partitions of 35 in which no part occurs only once. 686 is 2000 in bas...

861 = 3 x 7 x 41. 861 is the 41st triangular number . It is also a hexagonal number . 861 = 7 + 77 + 777. 144,648 = 861 x 168 = 492 x 294. T...

477 = 3 2 x 53, 477 has a representation as a sum of two squares: 477 = 6 2 + 21 2 . 477 is a pentagonal number . 477 is the smallest numb...

380 = 2 2 x 5 x 19. 380 is a pronic number because it is the product of two consecutive numbers: 380 = 19 x 20. Hence, it is also twice a ...

62 = 2 x 31. 62 is 222 in base 5. 62 = 14 + 15 + 16 + 17. 62 is the smallest number that can be written as the sum of three distinct squares...