Sequences A046641,A072168,A072169 and A023172

[Yuval Dekel]

Hello ,
Apart from the first zero at A046641 aren't these 3 sequences identical ?
Is each of them infinite ?

Let me ask also if A023172 is infinite .

Thanks,
Yuval

http://www.research.att.com/projects/OEIS?Anum=A046641
http://www.research.att.com/projects/OEIS?Anum=A072168
http://www.research.att.com/projects/OEIS?Anum=A072169

http://www.research.att.com/projects/OEIS?Anum=A023172

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