a(n) = sigma_2(a(n-1)): 10|a(n>3) ?

zak seidov zakseidov at yahoo.com
Wed May 14 09:09:20 CEST 2008

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Rule: 
a(n>1)=sigma_2(a(n-1)) with a(1)=2.
SEQ starts:
2,5,26,850,943950.
My Q:
Are all next terms divisible by 10?
thanks, zak

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