Question Number 151911 by mathdanisur last updated on 24/Aug/21
$$\mathrm{Determine}\:\mathrm{the}\:\mathrm{digit}\:\boldsymbol{\mathrm{a}}\:\mathrm{and}\:\mathrm{prime} \\ $$$$\mathrm{numbers}\:\boldsymbol{\mathrm{x}};\boldsymbol{\mathrm{y}};\boldsymbol{\mathrm{z}}\:\mathrm{such}\:\mathrm{that}\:\boldsymbol{\mathrm{x}}<\boldsymbol{\mathrm{y}},\:\boldsymbol{\mathrm{z}}<\mathrm{1000} \\ $$$$\mathrm{and}\:\:\mathrm{x}\:+\:\mathrm{y}^{\mathrm{2}\boldsymbol{\mathrm{a}}} \:=\:\mathrm{z} \\ $$
Commented by Rasheed.Sindhi last updated on 24/Aug/21
$$\mathrm{2}\boldsymbol{\mathrm{a}}\:{means}\:\mathrm{20},\mathrm{21},\mathrm{22},…,\mathrm{29}?\:{Or}\:\mathrm{2}\boldsymbol{\mathrm{a}}=\mathrm{2}×\boldsymbol{\mathrm{a}}? \\ $$$$'\mathrm{digit}\:\boldsymbol{\mathrm{a}}'\:{means}\:{decimal}\:{digit}? \\ $$
Commented by mathdanisur last updated on 24/Aug/21
$$\boldsymbol{\mathrm{S}}\mathrm{er},\:\mathrm{2a}=\mathrm{2xa}\: \\ $$$$\mathrm{a}=\mathrm{0},\mathrm{1},\mathrm{2},\mathrm{3},\mathrm{4},\mathrm{5},\mathrm{6},\mathrm{7},\mathrm{8},\mathrm{9} \\ $$$$\mathrm{2a}=\mathrm{2}\centerdot\mathrm{2}\:… \\ $$
Commented by mathdanisur last updated on 24/Aug/21
$$\mathrm{Solution}\:\mathrm{dear}\:\mathrm{Ser}\:\mathrm{please} \\ $$
Commented by Rasheed.Sindhi last updated on 24/Aug/21
$$\mathrm{x}\:+\:\mathrm{y}^{\mathrm{2}\boldsymbol{\mathrm{a}}} \:=\:\mathrm{z};\:\boldsymbol{\mathrm{x}}<\boldsymbol{\mathrm{y}},\:\boldsymbol{\mathrm{z}}<\mathrm{1000};\mathrm{x},\mathrm{y},\mathrm{z}\in\mathbb{P} \\ $$$$\:^{\bullet} \mathrm{a}=\mathrm{0}:\:\mathrm{x}+\mathrm{1}=\mathrm{z}\Rightarrow\mathrm{x}=\mathrm{2},\mathrm{z}=\mathrm{3}\:\:\forall\mathrm{y}\left(<\mathrm{1000}\right)\in\mathbb{P}\: \\ $$$$\left(\mathrm{Two}\:\mathrm{primes}\:\mathrm{having}\:\mathrm{difference}\:\mathrm{1}\:\mathrm{are}\right. \\ $$$$\left.\mathrm{only}\:\mathrm{2}\:\&\:\mathrm{3}\right) \\ $$$$\:^{\bullet} \mathrm{a}=\mathrm{1}:\:\mathrm{2}+\mathrm{3}^{\mathrm{2}} =\mathrm{11} \\ $$
Commented by mathdanisur last updated on 24/Aug/21
$$\left({x},{y},{z},{a}\right)\in\left\{\left(\mathrm{0},\mathrm{2},{p},\mathrm{3}\right)\left(\mathrm{2},\mathrm{3},\mathrm{11},\mathrm{1}\right)\left(\mathrm{2},\mathrm{3},\mathrm{83},\mathrm{2}\right)\right. \\ $$$${p}={prime} \\ $$
Commented by MJS_new last updated on 24/Aug/21
$$\mathrm{0}\:\mathrm{is}\:\mathrm{not}\:\mathrm{a}\:\mathrm{prime}\:\mathrm{number} \\ $$
Commented by mathdanisur last updated on 24/Aug/21
$$\mathrm{in}\:\mathrm{the}\:\mathrm{statement}\:\mathrm{a}\:\mathrm{is}\:\mathrm{digit} \\ $$$$\mathrm{i}.\mathrm{e}\:\mathrm{is}\:\mathrm{in}\:\mathrm{the}\:\mathrm{set}\:\left\{\mathrm{0},\mathrm{2},…,\mathrm{9}\right\} \\ $$
Commented by MJS_new last updated on 24/Aug/21
$$\left({x},{y},{z},{a}\right)\in\left\{\left(\mathrm{0},\mathrm{2},{p},\mathrm{3}\right)\left(\mathrm{2},\mathrm{3},\mathrm{11},\mathrm{1}\right)\left(\mathrm{2},\mathrm{3},\mathrm{83},\mathrm{2}\right)\right. \\ $$$$ \\ $$
Commented by MJS_new last updated on 24/Aug/21
$$\mathrm{you}\:\mathrm{don}'\mathrm{t}\:\mathrm{seem}\:\mathrm{to}\:\mathrm{understand}\:\mathrm{anything}. \\ $$
Commented by Rasheed.Sindhi last updated on 24/Aug/21
$$\left({x},{y},{z},{a}\right)\in\left\{\left(\mathrm{2},{p},\mathrm{3},\mathrm{0}\right)\left(\mathrm{2},\mathrm{3},\mathrm{11},\mathrm{1}\right)\left(\mathrm{2},\mathrm{3},\mathrm{83},\mathrm{2}\right)\right\} \\ $$