

A165501


Minimal common difference of maximal arithmetic progression starting at n such that each term k has tau(k)=tau(n)


2



1, 2, 5, 6, 2, 150, 19, 16, 12, 1536160080, 8, 9918821194590, 300, 188, 65, 341976204789992332560, 157, 2166703103992332274919550, 24, 450, 3072320160
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OFFSET

2,2


COMMENTS

a(1) is not well defined, since the maximal progression has only one term.


LINKS

Table of n, a(n) for n=2..22.


EXAMPLE

For n=6, A165500(n)=3, and the least difference d such that tau(6) = tau(6+d) = tau(6+2d) is d=2, so a(6)=2.


CROSSREFS

Cf. A165499, A165500, A088430.
Sequence in context: A021800 A140862 A305210 * A274614 A353771 A340859
Adjacent sequences: A165498 A165499 A165500 * A165502 A165503 A165504


KEYWORD

hard,nonn,more


AUTHOR

Hugo van der Sanden, Sep 21 2009, Oct 09 2009


EXTENSIONS

Extended to n=22 taking advantage of A088430 for n=19, Hugo van der Sanden, Jun 02 2015


STATUS

approved



