Perfect Number is a number which can be expressed as the sum of all factors of the numbers excluding itself but including ‘1’. 6, 28, 496 and 8128 are the first four perfect numbers. 6 = 1 + 2 + 3 28 = 1 + 2 + 4 + 7 + 14 496 = 1…
It is possible to count up to 1023 just by using the fingers of two hands. By applying Binary system it is possible to count up to 1023 just by using the fingers of two hands. It employs two digits, 0 and 1. If a finger or a thumb standing up indicates ‘1’ and standing…
What is the commonality between – 153, 370, 371, and 407? We can observe that, 13 + 53 + 33 = 1 + 125 + 27 = 153 33 + 73 + 03 = 27 + 343 + 0 = 370 33 + 73 + 13 = 27 + 343 + 1 = 371 43…
‘37’ is the 12th prime number and ‘73’ is the 21st prime number. ‘73’ is the mirror image of 37 and 21 is the mirror image of 12. Moreover, the factors of 21 are 3 and 7, the digits which constitute 37 and 73. 73 is an ‘emirp’ (prime spelled backwards). When we reverse the…
Pythagoras, after proving the great theorem, offered a hundred oxen to the Muses as gratitude for the inspiration. It was a gesture of humility as well as pride. Every mathematician, scientist and thinker believes that the theorem is a part of a key to the structure of nature itself. The figure deputes the Egyptian Triangle…
221B Baker Street happens to be the house of Sherlock Holmes. Incidentally, the number 221 has several significances. 221 = 13×17 is a product of two prime numbers. It is called a semi-prime number. Some other examples are 6(2×3), 10(2×5), 14(2×7), 21(3×7), 22(2×11), 26(2×13), 33(3×11), 35(5×7), 39(3×13), 49(7×7), 51(3×17), 55(5×11), 57(3×19), 62(2×31), 65(5×13), 69(3×23), 77(7×11),…
