Vendeur : AHA-BUCH GmbH, Einbeck, Allemagne
Taschenbuch. Etat : Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A sum-product number is an integer that in a given base is equal to the sum of its digits times the product of its digits. Or, to put it algebraically, given an integer n that is l digits long in base b (with dx representing the xth digit), if n = (sum_{i = 1}^l d_i)(prod_{j = 1}^l d_j) then n is a sum-product number in base b. In base 10, the only sum-product numbers are 0, 1, 135, 144 (sequence OEIS¿A038369). Thus, for example, 144 is a sum-product number because 1 + 4 + 4 = 9, and 1 × 4 × 4 = 16, and 9 × 16 = 144.1 is a sum-product number in any base, because of the multiplicative identity. 0 is also a sum-product number in any base, but no other integer with significant zeroes in the given base can be a sum-product number. 0 and 1 are also unique in being the only single-digit sum-product numbers in any given base; N° de réf. du vendeur 9786139153879
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Vendeur : buchversandmimpf2000, Emtmannsberg, BAYE, Allemagne
Taschenbuch. Etat : Neu. This item is printed on demand - Print on Demand Titel. Neuware OmniScriptum SRL, Str. Armeneasca 28/1, office 1, 2012 Chisinau 84 pp. Englisch. N° de réf. du vendeur 9786139153879
Quantité disponible : 1 disponible(s)