[seqfan] Re: Numbers with 3 divisors

[Eric Angelini]

21 = 1*3*7
22 = 1*2*11

-----Message d'origine-----
De : seqfan-bounces at list.seqfan.eu [mailto:seqfan-bounces at list.seqfan.eu] De la part de Harvey P. Dale
Envoyé : jeudi 18 août 2011 13:42
À : seqfan at seqfan.eu
Objet : [seqfan] Numbers with 3 divisors

            Is it true that all numbers with exactly three divisors,
with the exception only of 4 and 25, have either 1 or 9 as their last
decimal digit?

            Best,

            Harvey


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