42 (forty-two) is the natural number following 41 and preceding 43. The number has received considerable attention in popular culture due to its appearance in The Hitchhiker's Guide to the Galaxy, as "the Answer to the Ultimate Question of Life, the Universe, and Everything."
Forty-two is an abundant number; its factorization 2 · 3 · 7 makes it the second sphenic number and also the second of the form { 2 · 3 · r }. As with all sphenic numbers of...
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42 (forty-two) is the natural number following 41 and preceding 43. The number has received considerable attention in popular culture due to its appearance in The Hitchhiker's Guide to the Galaxy, as "the Answer to the Ultimate Question of Life, the Universe, and Everything."
Forty-two is an abundant number; its factorization 2 · 3 · 7 makes it the second sphenic number and also the second of the form { 2 · 3 · r }. As with all sphenic numbers of this form, the aliquot sum is abundant by 12. 42 is also the second sphenic number to be bracketed by twin primes; 30 also rests between two primes. 42 has a 14 member aliquot sequence 42, 54, 66, 78, 90, 144, 259, 45, 33, 15, 9, 4, 3, 1, 0 and is itself part of the aliquot sequence commencing with the first sphenic number 30. Further, 42 is the 10th member of the 3-aliquot tree.
42 is the product of the first three terms of Sylvester's sequence; like the first five such numbers it is also a primary pseudoperfect number.
It is the sum of the...
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