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2014-10-28T09:13:20+02:00
N=80a+1        n-1 = 80a = 2^4 ·5a
n=26b +1       n-1 =26b = 2 ·13b
n=24c+1        n-1 =24c = 2³ ·3c
cmmmc [80,26,24] = 2^4 ·3·5·13 = 3120
n -1 =3120 ⇒ n= 3121
3121 = 80·39 + 1
3121 = 26·120 + 1
3121 = 24·130 + 1