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Forty-Two is a pronic number and an abundant number; its prime 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 is also a pronic number and 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.
It is a Catalan number. Consequently; 42 is the number of noncrossing partitions of a set of five elements, the number of triangulations of a heptagon, the number of rooted ordered binary trees with six leaves, the number of ways in which five pairs of nested parentheses can be arranged, etc.
The atomic number of molybdenum & the angle rounded to whole degrees for which a rainbow appears (the critical angle). In the TIFF image file format, the second 16-bit word of every file is 42, which is used together with the first word to indicate byte order.
Google returns this number when "the answer to life the universe and everything" is entered in an internet search.
In Japanese culture, the number 42 is considered unlucky because the numerals when pronounced separately — "shi ni" (four two) — sound like the phrase, "unto death". The Gutenberg Bible is also known as the "42-line Bible", as the book contained 42 lines per page.
(c) Hotpix / HotpixUK Tony Smith - tone@Hotpix.freeserve.co.uk WDCC
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