Composite Numbers

32

The divisors of 10 are 1, 2, 5, and 10.

Composite.

prime numbers between 12 and18: 13, & 17

The number 20 is.

9

A composite number has more than 2 factors whereas a prime number only has 2 factors which are itself and one

1 is neither a prime nor a composite number because it has only one factor (itself (1)). The definition of a prime number is a number that has the factor of one and itself, so one is not prime. The definition of a composite number is a number that has more than 2 factors, so one is not composite. One is a special number.

composite and 2*2*7 = 28

10 is a composite number because it has more than 2 factors

31 and 37

19 numbers. They are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30

There aren't any except 21, 22, and 24.

3

The list of composite numbers between 21 and 50 includes 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50.

I don't know if you're including 21 and 50 or not. Add them up however you like.

105, 111, 115, 117, 119, 121, 123, 125, 129, 133, 135, 141, 143, 145, 147, 153,

155, 159, 161, 165, 169, 171, 175, 177, 183, 185, 187, 189, 195, 201, 203, 205,

207, 209, 213, 215, 217, 219, 221, 225, 231, 235, 237, 243, 245, 247, 249, 253,

255, 259, 261, 265, 267, 273, 275, 279, 285, 287, 289, 291, 295, 297, 299, 301,

303, 305, 309, 315, 319, 321, 323, 325, 327, 329, 333, 335, 339, 341, 343, 345,

351, 355, 357, 361, 363, 365, 369, 371, 375, 377, 381, 385, 387, 391, 393, 395,

399, 403, 405, 407, 411, 413, 415, 417, 423, 425, 427, 429, 435, 437, 441, 445,

447, 451, 453, 455, 459, 465, 469, 471, 473, 475, 477, 481, 483, 485, 489, 493,

495, 497, 501, 505, 507, 511, 513, 515, 517, 519, 525, 527, 529, 531, 533, 535,

537, 539, 543, 545, 549, 551, 553, 555, 559, 561, 565, 567, 573, 575, 579, 581,

583, 585, 589, 591, 595, 597, 603, 605, 609, 611, 615, 621, 623, 625, 627, 629,

633, 635, 637, 639, 645, 649, 651, 655, 657, 663, 665, 667, 669, 671, 675, 679,

681, 685, 687, 689, 693, 695, 697, 699, 703, 705, 707, 711, 713, 715, 717, 721,

723, 725, 729, 731, 735, 737, 741, 745, 747, 749, 753, 755, 759, 763, 765, 767,

771, 775, 777, 779, 781, 783, 785, 789, 791, 793, 795, 799, 801, 803, 805, 807,

813, 815, 817, 819, 825, 831, 833, 835, 837, 841, 843, 845, 847, 849, 851, 855,

861, 865, 867, 869, 871, 873, 875, 879, 885, 889, 891, 893, 895, 897, 899, 901,

903, 905, 909, 913, 915, 917, 921, 923, 925, 927, 931, 933, 935, 939, 943, 945,

949, 951, 955, 957, 959, 961, 963, 965, 969, 973, 975, 979, 981, 985, 987, 989,

993, 995, 999.

Having wasted my time compiling this list of 307 odd 3 digit composites, I would be interested to know what, if anything, you will do with this information.

Any number except 61 67 71 73 and 79 which are prime numbers

No. If you multiply any prime number (such as 2, 3, 5, 7, or 11) by 1, you will get a prime number.

It has more than two factors.

prime

70 is a composite number because it has more than two factors

The answer depends on the value of C, which is unknown.

4, 6, 8, 9, 10, 12

The prime numbers of 100 are: 2, 2, 5 and 5