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A303578 List of starts of nondecreasing runs of values of d(n) (the divisor function A000005(n)). 5

%I #12 Apr 29 2018 12:00:21

%S 1,5,7,9,11,13,17,19,21,23,25,29,31,33,37,41,43,46,47,49,51,53,55,57,

%T 59,61,65,67,69,71,73,77,79,81,82,83,85,89,91,93,97,101,103,106,107,

%U 109,111,113,115,118,121,125,127,129,131,133,137,139,141,145,149,151,153,155,157,161,163,166,167,169,171,173,175

%N List of starts of nondecreasing runs of values of d(n) (the divisor function A000005(n)).

%H Seiichi Manyama, <a href="/A303578/b303578.txt">Table of n, a(n) for n = 1..10000</a>

%o (AWK) # Assume that b.txt contains a b-file for A000005

%o awk ' BEGIN {i = 1; print i}

%o {if ($2 < i) print $1; i = $2} ' b.txt >out

%Y Cf. A000005.

%Y A303577 gives the lengths of the successive runs.

%Y A284597(m) is the smallest number that starts a run of length m.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Apr 29 2018

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Last modified April 24 11:49 EDT 2024. Contains 371936 sequences. (Running on oeis4.)