| 61 (number) |
Article Index for 61 |
Information About61 (number) |
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IN MATHEMATICS It is the 18th Prime Number . The previous is 59 , with which it comprises a Twin Prime . Sixty-one is a Cuban Prime of the form . Sixty-one might be the largest prime that divides the product of the next two primes plus 1. If there is a larger such prime, it would have to be greater than 179424673. Sixty-one is the sum of two squares, 52 + 62, and it is also a Centered Square Number , a Centered Hexagonal Number and a Centered Decagonal Number . It is also a Keith Number , because it recurs in a Fibonacci-like sequence started from its base 10 digits: 6, 1, 7, 8, 15, 23, 38, 61... IN SCIENCE In the Periodic Table The chemical element with the Atomic Number 61 ( Promethium ), a lanthanide, is the element with the secondary lowest ordinal number, which does not possess any stable isotopes. The promethium preceding element with Atomic Number 60 ( Neodymium ) and the promethium following element 62 ( Samarium ) have all stable isotopes. In Astronomy : Messier Object M61 , a Magnitude 10.5 Galaxy in the Constellation Virgo : The , a double Spiral Galaxy in the constellation Pisces :The series which began on -973 May 10 and ended on 289 June 5 . The duration of Saros series 61 was 1262.1 years, and it contained 71 solar eclipses. :The Saros number of the Lunar Eclipse series which began on -870 October 20 and ended on 609 March 26 . The duration of Saros series 61 was 1478.4 years, and it contained 83 lunar eclipses. IN OTHER FIELDS Sixty-one is:
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