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The first: 4, 8, 9, 16, 25, 27, 32, 36, 49, 64, 81, 100 (sequence A001597 in the OEIS). 1 is sometimes included. A powerful number (also called squareful ) has multiplicity above 1 for all prime factors.
The trimagic series would be related in the same way to the hyper-pyramidal sequence of nested cubes. Cubes 0, 1, 8, 27, 64, 125, 216, ... (sequence A000578 in the OEIS )
Name First elements Short description OEIS Mersenne prime exponents : 2, 3, 5, 7, 13, 17, 19, 31, 61, 89, ... Primes p such that 2 p − 1 is prime.: A000043 ...
This sequence is the lexicographically first infinite Salem–Spencer set. [5] Another infinite Salem–Spencer set is given by the cubes 0, 1, 8, 27, 64, 125, 216, 343, 512, 729, 1000, ...
Informally, a sequence has a limit if the elements of the sequence become closer and closer to some value (called the limit of the sequence), and they become and remain arbitrarily close to , meaning that given a real number greater than zero, all but a finite number of the elements of the sequence have a distance from less than .
Shares in Ford were down 1.8% following news of the measures, which will be a big blow in particular for Germany, where Europe's bigg Ford to cut European jobs as EV shift, Chinese rivals take ...
The Atlantic, Sep 1, 2016 Share on Facebook Share on Twitter The unpleasant reality that I have had to accept is that there will be no new Donald Trump, just the same candidate who will slash and burn and trample anything and anyone he perceives as being in his way or an easy scapegoat.
Second edition of the book. Neil Sloane started collecting integer sequences as a graduate student in 1964 to support his work in combinatorics. [8] [9] The database was at first stored on punched cards.