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33 is the 21st composite number, and 8th distinct semiprime (third of the form where is a higher prime). [1] It is one of two numbers to have an aliquot sum of 15 = 3 × 5 — the other being the square of 4 — and part of the aliquot sequence of 9 = 3 2 in the aliquot tree (33, 15, 9, 4, 3, 2, 1).
The number 34 has an aliquot sum of 20, and is the seventh member in the aliquot sequence (34, 20, 22, 14, 10, 8, 7, 1, 0) that belongs to the prime 7-aliquot tree. 34 is the sum of the first two perfect numbers 6 + 28, [3] whose difference is its composite index . [4] Its reduced totient and Euler totient values are both 16 (or 4 2 = 2 4).
7 is the only number D for which the equation 2 n − D = x 2 has more than two solutions for n and x natural. In particular, the equation 2 n − 7 = x 2 is known as the Ramanujan–Nagell equation. 7 is one of seven numbers in the positive definite quadratic integer matrix representative of all odd numbers: {1, 3, 5, 7, 11, 15, 33}. [19] [20]
A study presented earlier this month found that smaller temporalis muscles could indicate dementia. A brain health coach shares the warning signs to look for.
The arrests occur amid a number of reported drone sightings in the Northeast, including New Jersey, New York and Pennsylvania.
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M33 X-7 is a black hole binary system in the Triangulum Galaxy.The system is made up of a stellar-mass black hole and a companion star. The black hole in M33 X-7 has an estimated mass of 15.65 times that of the Sun (M ☉) [3] [4] (formerly the largest known stellar black hole, though this has now been superseded amongst electromagnetically-observed black holes by an increased mass estimate ...
Jill Jacobson, known for her roles on "Star Trek: The Next Generation" and the primetime soap opera "Falcon Crest," died in Los Angeles on Dec. 8.