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Question Number 46045 by Tawa1 last updated on 20/Oct/18

$$\mathrm{A}\mathrm{number}\mathrm{is}\mathrm{said}\mathrm{to}\mathrm{be}{}^{″}\mathrm{right}{\mathrm{prime}}^{″}\mathrm{if}\mathrm{despite}\mathrm{dropping}\mathrm{the}\mathrm{left}\mathrm{most}$$$$\mathrm{digits}\mathrm{successively},\mathrm{Number}\mathrm{continues}\mathrm{to}\mathrm{be}\mathrm{a}\mathrm{prime}\mathrm{number}.$$$$\mathrm{For}\mathrm{example}:223\mathrm{is}\mathrm{a}\mathrm{right}\mathrm{prime}\mathrm{because}\mathrm{despite}\mathrm{dropping}2\mathrm{from}\mathrm{left}$$$$\mathrm{most}\mathrm{part},\mathrm{we}\mathrm{obtain}23\mathrm{as}\mathrm{the}\mathrm{prime}\mathrm{number}.\mathrm{Next},\mathrm{even}\mathrm{after}\mathrm{dropping}$$$$2\mathrm{from}\mathrm{left},3\mathrm{is}\mathrm{a}\mathrm{prime}.$$$$\mathrm{How}\mathrm{many}\mathrm{two}\mathrm{digit}\mathrm{numbers}\mathrm{are}\mathrm{right}\mathrm{prime}?$$

Answered by MJS last updated on 20/Oct/18

$$\mathrm{we}\mathrm{only}\mathrm{have}\mathrm{to}\mathrm{check}x3\mathrm{and}x7$$$$1317233743475367738397$$$$11\mathrm{numbers}$$

Commented by Tawa1 last updated on 20/Oct/18

$$\mathrm{God}\mathrm{bless}\mathrm{you}\mathrm{sir}$$

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