What is a uncommon number?

The smallest weird number is 70. Its proper divisors are 1, 2, 5, 7, 10, 14, and 35; these sum to 74, but no subset of these sums to 70. The number 12, for example, is abundant but not weird, because the proper divisors of 12 are 1, 2, 3, 4, and 6, which sum to 16; but 2 + 4 + 6 = 12.

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Subsequently, who invented zero?

The first modern equivalent of numeral zero comes from a Hindu astronomer and mathematician Brahmagupta in 628. His symbol to depict the numeral was a dot underneath a number. People also ask what is mystery no? A mystery number is a number that can be expressed as the sum of two numbers and those two numbers should be the reverse of each other. Examples: Input : n = 121.

What is the only even prime number?

The unique even prime number 2. All other primes are odd primes. What does 999 mean in Chinese? 999 - It has a similar meaning to '666'. Because '9' looks like '6' upside down, so it usually mean something is even better than things we call '666'. It also have another meaning just like '99' for the same reason.

And another question, what are the most powerful numbers?

1, 4, 8, 9, 16, 25, 27, 32, 36, 49, 64, 72, 81, 100, 108, 121, 125, 128, 144, 169, 196, 200, 216, 225, 243, 256, 288, 289, 324, 343, 361, 392, 400, 432, 441, 484, 500, 512, 529, 576, 625, 648, 675, 676, 729, 784, 800, 841, 864, 900, 961, 968, 972, 1000, Also, how do you mentally multiply fast? The rule is simple. Multiply from left to right. One digit at a time. Left to right multiplication is faster because you have to remember fewer numbers to recall and use later.