digit sequence

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• Digit sum — In mathematics, the digit sum of a given integer is the sum of all its digits, (e.g.: the digit sum of 84001 is calculated as 8+4+0+0+1 = 13). Digit sums are most often computed using the decimal representation of the given number, but… …   Wikipedia

• digit — noun ADJECTIVE ▪ binary, decimal ▪ the decimal digits 0 to 9 ▪ double, single ▪ double digit inflation … OF DIGITS …   Collocations dictionary

• De Bruijn sequence — A diagram showing the De Bruijn sequence where k=2 and n=2 In combinatorial mathematics, a k ary De Bruijn sequence B(k, n) of order n, named after the Dutch mathematician Nicolaas Govert de Bruijn, is a cyclic sequence of a given alphabet A …   Wikipedia

• Look-and-say sequence — The lines show the growth of the numbers of digits in the look and say sequences with starting points 23 (red), 1 (blue), 13 (violet), 312 (green). These lines (when represented in a logarithmic scale) tend to straight lines whose slopes coincide …   Wikipedia

• Numerical digit — The ten digits of the Arabic numerals, in order of value. A digit is a symbol (a numeral symbol such as 3 or 7 ) used in combinations (such as 37 ) to represent numbers in positional numeral systems. The name digit comes from the fact that the 10 …   Wikipedia

• Primefree sequence — In mathematics, a primefree sequence is a sequence of integers that does not contain any prime numbers. More specifically, it generally means a Fibonacci like sequence with composite but coprime initial terms that is infinite but contains no… …   Wikipedia

• Complete sequence — In mathematics, an integer sequence is called a complete sequence if every positive integer can be expressed as a sum of values in the sequence, using each value at most once. For example, the sequence of powers of two {1, 2, 4, 8, ...}, based on …   Wikipedia

• Perfect digit-to-digit invariant — A perfect digit to digit invariant (PDDI) (also known as a Munchausen number[1]) is a number that is equal to the sum of its digits each raised to a power equal to the digit. 0 and 1 are PDDIs in any base (using the convention that 00 = 0). Apart …   Wikipedia

• Euclid-Mullin sequence — The Euclid Mullin sequence is an infinite sequence of distinct prime numbers, in which each element is the least prime factor of one plus the product of all earlier elements.The first 43 elements of the sequence are OEIS|id=A000945::2, 3, 7, 43,… …   Wikipedia

• Disjunctive sequence — A disjunctive sequence is an infinite sequence (over a finite alphabet of characters) in which every finite string appears as a substring. For instance, the binary Champernowne sequence formed by concatenating all binary strings in shortlex order …   Wikipedia

• check digit — A digit often appended at the end of a string of digits; it is used for carrying out a check to verify the accuracy of a sequence or a customer number …   Big dictionary of business and management