

A111172


Position of first occurrence of n in A039819.


1



1, 2, 4, 3, 63, 5, 6115, 7, 8, 13, 761401060, 11
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OFFSET

1,2


COMMENTS

The sequence is welldefined because every integer occurs in the sequence A039819 at least once (see S. Colton, Theorem 5). a(11) is probably between 10^8 and 10^9, a(12)=11.


LINKS



EXAMPLE

a(6)=5 because the first 6 occurs in A039819 at position 5.


MATHEMATICA

c = 0; t = Table[0, {100}]; Do[d = DivisorSigma[0, n]; If[ Mod[n, d]==0, c++; If[d < 101 && t[[d]] == 0, t[[d]] = c; Print[{d, c, n}]]], {n, 10^9}]; t (* Robert G. Wilson v *)


CROSSREFS



KEYWORD

nonn,more


AUTHOR



EXTENSIONS



STATUS

approved



