## Monday, January 25, 2010

### Class task : Factors & Multiples

Please use your learning device to source for information on the following:

1. A man named Erastothenes
2. Erastothenes Sieve
3. All the Primes less than 1000
4. MERSENE PRIME

Prime Quiz (PART 1) for all as hw

1. Erastothenes was a Greek mathematician,elegiac poet, athlete, geographer, and astronomer who made discoveries and inventions including a system of latitude and longitude. He was the first Greek to calculate the circumference of the earth, and the tilt of the earth's axis.

2. They are 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67
71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163
167 173 179 181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269
271 277 281 283 293 307 311 313 317 331 337 347 349 353 359 367 373 379 383
389 397 401 409 419 421 431 433 439 443 449 457 461 463 467 479 487 491 499
503 509 521 523 541 547 557 563 569 571 577 587 593 599 601 607 613 617 619
631 641 643 647 653 659 661 673 677 683 691 701 709 719 727 733 739 743 751
757 761 769 773 787 797 809 811 821 823 827 829 839 853 857 859 863 877 881
883 887 907 911 919 929 937 941 947 953 967 971 977 983 991 997

3. Our source is wikipedia.

4. The sieve of Erastothenesis a simple, ancient algorithm for finding all prime numbers up to a specified integer. It works efficiently for the smaller primes (below 10 million).

Members: Stacey, Naveena, Michelle, Davina, Jia Le, Jun Wei

5. A Mersenne prime is a positive integer that is 1 less then a power of 2. eg: Mp= 2to the power of a prime number - 1.

Quote: Wikipedia (with minor rephrasing)