mersenneforum.org - 210=2*3*5*7

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enzocreti

2020-02-25 09:53

210=2*3*5*7

Is 210 the only primorial that can be written as n(n-1) with n an integer?

210=15*14

axn	2020-02-25 11:38

No.

2=1*2
6=2*3
30=2*3*5=5*6

510510=2*3*5*7*11*13*17=714*715

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