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Number of triangular

In math calculator calculate triangular number is a number that can be represented as the sum of consecutive integers starting.    
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Conversion between number bases

Converter allows you to convert numbers between number bases - binary (binary), trójkowym, czwórkowym, Friday, szóstkowym, siódemkowym, octal (octal), dziewiątkowym, decimal (decymalnym) jedenastkowym, dwunastkowym, trzynastkowym, czternastkowym, piętnastkowym, hexadecimal (hex). Typed characters that are not numbers and the letters A, B, C, D, E, F are ignored.      
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Trigonometric functions calculator

Calculator by entering an angle in degrees or radians calculated values ​​of the basic trigonometric functions.
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Sieve of Eratosthenes

The program generates the prime numbers in a given range using the sieve of Eratosthenes algorithm.        
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Verification ISBN preview

Jak sprawdzić numer ISBN?
Jak zweryfikować numer ISBN?
Calculator allows you to verify the ISBN number entered.
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Amount of paint necessary to paint the room

Calculator to estimate the amount of paint needed to paint a room by painting a single and double.                  
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Number of square-triangle (square triangular number)

Number of square-triangle has the properties of a square and a triangular number.