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2. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   That means 95,676,260,903,887,607 primes [3] (nearly 10 17), but they were not stored. There are known formulae to evaluate the prime-counting function (the number of primes smaller than a given value) faster than computing the primes. This has been used to compute that there are 1,925,320,391,606,803,968,923 primes (roughly 2 × 10 21) smaller ...

3. List of Mersenne primes and perfect numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_Mersenne_primes...

   [10] The following is a list of all currently known Mersenne primes and perfect numbers, along with their corresponding exponents p . As of 2024 [update] , there are 52 known Mersenne primes (and therefore perfect numbers), the largest 18 of which have been discovered by the distributed computing project Great Internet Mersenne Prime Search ...

4. Ordinal numeral - Wikipedia

   en.wikipedia.org/wiki/Ordinal_numeral

   Ordinal numbers may be written in English with numerals and letter suffixes: 1st, 2nd or 2d, 3rd or 3d, 4th, 11th, 21st, 101st, 477th, etc., with the suffix acting as an ordinal indicator. Written dates often omit the suffix, although it is nevertheless pronounced.

5. How To Write Numbers in Words on a Check - AOL

   www.aol.com/write-numbers-words-check-000044077.html

   If you’re wondering how to write $450 in words on a check, that would make $450 look like “Four hundred fifty and 00/100.” The fraction is there to protect you if someone intercepts your check.

6. Triangular number - Wikipedia

   en.wikipedia.org/wiki/Triangular_number

   This theorem does not imply that the triangular numbers are different (as in the case of 20 = 10 + 10 + 0), nor that a solution with exactly three nonzero triangular numbers must exist. This is a special case of the Fermat polygonal number theorem. The largest triangular number of the form 2 k − 1 is 4095 (see Ramanujan–Nagell equation).

7. Table of prime factors - Wikipedia

   en.wikipedia.org/wiki/Table_of_prime_factors

   The first: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 (sequence A005843 in the OEIS). An odd number does not have the prime factor 2. The first: 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23 (sequence A005408 in the OEIS). All integers are either even or odd. A square has even multiplicity for all prime factors (it is of the form a 2 for some a).