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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 (list; graph; refs; listen; history; text; internal format)
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: A143678 A021800 A140862 * A274614 A062825 A154925

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

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Last modified March 24 10:04 EDT 2017. Contains 283985 sequences.