[seqfan] A158248

[Don Reble]

    (Now that njas has called attention to it...)

> %C A158248 ... an exact root can always be taken of each.

    Yes, these values are second-and-higher powers of A001913.
    For each P in A001913, either all composite powers of P are here,
    or none are. A045616 has the None's (values of A001913 whose powers
    aren't in A158248).

> %C A158248 Comment from _Arkadiusz Wesolowski_, Jul 04 2012: A shorter
> description appears to be "Composite numbers with primitive root 10".

    He's right.

> %o A158248 (Other) // C program ...

    Does this program really belong here? (Indeed, does it belong
    anywhere?)

-- 
Don Reble  djr at nk.ca