# Number+to+be+divided

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**Personal Public Service Number**— The Personal Public Service Number (PPS No) (Irish: Uimhir Phearsanta Seirbhíse Poiblí , or Uimh. PSP ) is an identifier issued by Client Identity Services, Department of Social and Family Affairs on behalf of the Minister for Social and Family… …72

**Class number formula**— In number theory, the class number formula relates many important invariants of a number field to a special value of its Dedekind zeta function Contents 1 General statement of the class number formula 2 Galois extensions of the rationals 3 A …73

**National Number Group**— The UK Public Switched Telephone Network is divided up by area into National Number Groups (NNG s), and then further divided up into dialling codes. The structure of UK telephone numbers is a leading zero (replaced with +44 for international… …74

**API well number**— An API well number or API number is a unique, permanent, numeric identifier assigned to each well drilled for oil and gas in the United StatesAmerican Petroleum Institute, 1979, The API well number and standard state and county numeric codes… …75

**Rational number**— In mathematics, a rational number is any number that can be expressed as the quotient or fraction a/b of two integers, with the denominator b not equal to zero. Since b may be equal to 1, every integer is a rational number. The set of all… …76

**Mach number**— (mathrm{Ma} or M) (generally pronEng|ˈmɑːk, sometimes IPA|/ˈmɑːx/ or IPA|/ˈmæk/) is the speed of an object moving through air, or any fluid substance, divided by the speed of sound as it is in that substance. It is commonly used to represent an… …77

**Cryptographically secure pseudorandom number generator**— A cryptographically secure pseudo random number generator (CSPRNG) is a pseudo random number generator (PRNG) with properties that make it suitable for use in cryptography. Many aspects of cryptography require random numbers, for example: Key… …78

**38 (number)**— This article discusses the number thirty eight. For the year 38 CE, see 38. For other uses of 38, see 38 (disambiguation) ← 37 39 → 38 ← …79

**496 (number)**— ← 495 497 → 496 List of numbers Integers ← 0 100 …80

**Octahedral number**— 146 magnetic balls, packed in the form of an octahedron In number theory, an octahedral number is a figurate number that represents the number of spheres in an octahedron formed from close packed spheres. The nth octahedral number On can be… …