Parinari | |
|---|---|
| Country |  |
| Region | Loreto |
| Province | Loreto |
| Founded | February 7, 1866 |
| Capital | Parinari |
| Government | |
| • Mayor | Víctor Manuel García Acosta |
| Area | |
| • Total | 12,951.7 km2 (5,000.7 sq mi) |
| Elevation | 107 m (351 ft) |
| Population | |
| • Total | 7,394 |
| • Density | 0.57/km2 (1.5/sq mi) |
| Time zone | UTC-5 (PET) |
| UBIGEO | 160302 |
Parinari District is one of five districts of the province Loreto in Peru. [1]
In mathematics, an almost perfect number (sometimes also called slightly defective or least deficientnumber) is a natural number n such that the sum of all divisors of n (the sum-of-divisors function σ(n)) is equal to 2n − 1, the sum of all proper divisors of n, s(n) = σ(n) − n, then being equal to n − 1. The only known almost perfect numbers are powers of 2 with non-negative exponents (sequence A000079 in the OEIS). Therefore the only known odd almost perfect number is 20 = 1, and the only known even almost perfect numbers are those of the form 2k for some positive number k; however, it has not been shown that all almost perfect numbers are of this form. It is known that an odd almost perfect number greater than 1 would have at least six prime factors.
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Marcelin is a village in the administrative district of Gmina Szczecinek, within Szczecinek County, West Pomeranian Voivodeship, in north-western Poland.
Chemometrics and Intelligent Laboratory Systems is a peer-reviewed scientific journal sponsored by the Chemometrics Society and published since 1986 by Elsevier. The current editor-in-chief is R. Tauler.
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|---|---|
| Alto Amazonas | |
| Datem del Marañón | |
| Loreto | |
| Mariscal Ramón Castilla | |
| Maynas | |
| Putumayo | |
| Requena | |
| Ucayali | |
Coordinates: 4°34′18″S74°44′38″W / 4.5718°S 74.7439°W
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