[seqfan] Re: Help me understand these sequences

Hans Havermann pxp at rogers.com
Mon Mar 29 19:38:20 CEST 2010


> A144565 ("a(n)=p-th digit of 2^(1/2) where p = n-th prime."):
> By the description, this is a duplicate of A090204.  But the values
> don't match at all.  What is this?


> Typical of the quality of submissions from this author.

Submitted on the same day as A144565 and by the same author are  
A144566 to A144569.


Numbers with more prime factors (multiples counted) than the values of  
their largest prime factor. 72 and 81 are missing.


These are, in order and excluding the first term, the primes in  
A074320. However, a 5 is missing after the second 19.


48, 63, 99 are missing. 158, 189 shouldn't be there.


The second 56 should be 58. 72 shouldn't be there.

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