[seqfan] Analogue of A170818; Product of distinct primes of the form 6n+1 (A002476 ) dividing n.

Jonathan Post jvospost3 at gmail.com
Thu Dec 24 07:42:43 CET 2009


Analogue of A170818
1, 1, 1, 1, 1, 1, 7, 1, 1, 1, 1, 1, 13, 7, 1, 1, 1, 1, 19, 1, 7, 1, 1,
1, 1, 13, 1, 7, 1, 1, 31, 1, 1, 1, 7, 1, 37, 19
Product of distinct primes of the form 6n+1 (A002476 ) dividing n.
offset 1,7

similarly there's the analogue
1, 1, 1, 1, 5, 1, 1, 1, 1, 5, 11, 1, 1, 1, 5, 1, 17, 1, 1, 5, 1, 11,
23, 1, 5, 1, 1, 1, 29, 5, 1, 1, 11
Product of distinct primes of the form 6n-1 (A007528) dividing n
which on search I see as:
A140214  	Prod(h: h=5 mod 6 and h|n).
or is that different at a(25)? No, seems the same.

So all these, the ones above and A170817-A170819 should be xref'd, I think.




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