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55 is: the 10th Fibonacci number [ 1 ] and the 10th triangular number , [ 2 ] The sum of 55's digits is also 10. the 5th heptagonal number , [ 3 ] the 5th square pyramidal number , [ 4 ] and the 4th centered nonagonal number .
A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]
The name "Fibonacci sequence" was first used ... Binet's formula provides a proof that a positive integer x is a Fibonacci number ... and 55 are the only ...
The name of a number 10 3n+3, where n is greater than or equal to 1000, is formed by concatenating the names of the numbers of the form 10 3m+3, where m represents each group of comma-separated digits of n, with each but the last "-illion" trimmed to "-illi-", or, in the case of m = 0, either "-nilli-" or "-nillion". [17]
The rule of 55 is an IRS provision that allows workers who leave their job for any reason to start taking penalty-free distributions from their current employer’s retirement plan in or after the ...
X-55 is the Lockheed Martin X-55 aircraft. X55, X.55, X-55, or variation may also refer to: ... Senova X55, former name of the Beijing X5 compact crossover SUV;
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 ...
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