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A165495 First result not divisible by 4 when iterating k -> k+tau(k) from 2(2n-1)^2 2
7, 38, 71, 122, 178, 265, 415, 486, 602, 799, 927, 1230, 1321, 1486, 1810, 1951, 2214, 2474, 2830, 3194, 3386, 3738, 4206, 4639, 4874, 5358, 5838, 6222, 6534, 7101, 7482, 8145, 8570, 9010, 9722, 10922, 10922, 11434, 11882, 12571, 13274 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

This sequence and A165494 explore a critical aspect of the behavior of A064491.

LINKS

Table of n, a(n) for n=1..41.

EXAMPLE

For a(2) we start at 2.3^2=18; 18+tau(18)=24; 24+tau(24)=32; 32+tau(32)=38, which is not divisible by 4, so a(2)=38.

CROSSREFS

Cf. A064491, A165494, A165496

Sequence in context: A129736 A220852 A003352 * A034858 A249354 A249021

Adjacent sequences:  A165492 A165493 A165494 * A165496 A165497 A165498

KEYWORD

easy,nonn

AUTHOR

Hugo van der Sanden, Sep 21 2009

STATUS

approved

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Last modified May 24 09:32 EDT 2017. Contains 286963 sequences.