[seqfan] Re: A083207 On an observation of Frank Buss.

[Donald Alan Morrison]

> If you take the intersection of the zk numbers and the squarefree
> numbers (in the same region), the intersection's max deltas will all
> be multiples of 12.  Their intersection contains no primes (since no
> zk can be prime).  The zk numbers are a special case of the
> NP-Complete problem (the partition problem).

tdeltas = [(24, 30), (36, 174), (48, 762), (72, 5106)] # tuple (delta, i)

sage: f = map(factor, flatten(tdeltas))
sage: for a in f:
....:     print a
....:
2^3 * 3
2 * 3 * 5
2^2 * 3^2
2 * 3 * 29
2^4 * 3
2 * 3 * 127
2^3 * 3^2
2 * 3 * 23 * 37