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darani · Posted: September 27 2008 Post subject:

1,089 * 1 = 1,089
1,089 * 2 = 2,178
1,089 * 3 = 3,267
1,089 * 4 = 4,356
1,089 * 5 = 5,445
1,089 * 6 = 6,534
1,089 * 7 = 7,623
1,089 * 8 = 8,712
1,089 * 9 = 9,801

darani · Posted: September 27 2008 Post subject:

1,089 * 9 = 9,801

10,989 * 9 = 98,901

109,989 * 9 = 989,901

darani · Posted: September 27 2008 Post subject:

21,978 * 4 = 87,912
219,978 * 4 = 879,912
2,199,978 * 4 = 8,799,912
21,999,978 * 4 = 87,999,912
219,999,978 * 4 = 879,999,912
2,199,999,978 * 4 = 8,799,999,912

darani · Posted: September 27 2008 Post subject:

darani · Posted: September 27 2008 Post subject:

Friendly numbers

The proper divisors of 220 are 1, 2, 4, 5, 10, 11, 20, 22, 44, 55, and 110.
Their sum is 1+2+4+5+10+11+20+22+44+55+110 = 284.

The proper divisors of 284 are 1, 2, 4, 71, and 142, and their sum is
1 + 2 + 4 + 71 + 142 = 220.

C hw d frndship has been given between 220 and 284....

similarly

The sum of the proper factors of 17,296 is
1 + 2 + 4 + 8 + 16 + 23 + 46 + 47 + 92 + 94 + 184 + 188 + 368
+ 376 + 752 + 1,081 + 2,162 + 4,324 + 8,648 = 18,416

The sum of the proper factors of 18,416 is
1 + 2 + 4 + 8 + 16 + 1,151 + 2,302 + 4,604 + 9,208 = 17,296

Similarly u have many more like....
1,184 and 1,210
2,620 and 2,924
5,020 and 5,564
6,232 and 6,368
10,744 and 10,856
9,363,584 and 9,437,056
111,448,537,712 and 118,853,793,424

darani · Posted: September 27 2008 Post subject:

Square of friendly numbers....

6,205 = 38^2 + 69^2 and 3,869 = 62^2 + 05^2

5,965 = 77^2 + 06^2 and 7,706 = 59^2 + 65^2

^ -> means power....

darani · Posted: September 27 2008 Post subject:

Amazing palindrome numbers

11^1 = 11
11^2 = 121
11^3 = 1,331
11^4 = 14,641

always u can rely on powers of 11

interesting rite...........

darani · Posted: September 27 2008 Post subject:

Other way for attaining palindrome of numbers

23 + 32 = 55 .......... a palindrome

75 + 57 = 132 ......... 132 + 231 = 363 ........ a palindrome

86+68=154 ..... 154+451=605 ....... 605+506=1111 ....... a palindrome

darani · Posted: September 27 2008 Post subject: upto 30

Fun with Figurate Numbers

sunnyajmal · V I P Joined: 18 Feb 2008 Posts: 8649 Location: Hearts

nice...

darani · Posted: September 27 2008 Post subject:

thnx mate.....

darani · Posted: September 30 2008 Post subject:

anyone has important things like this?

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