%I #8 Oct 29 2019 04:40:13
%S 1,7,5,35,25,18,13,10,70,49,36,26,2,14,11,8,6,42,3,21,15,105,74,52,4,
%T 28,20,140,98,69,50,37,27,19,133,94,66,47,33,24,17,12,9,63,45,32,23,
%U 161,113,80,56,40,29,22,16,112,79,57,41,30,210,147,103,73,53
%N Lexicographically earliest sequence of distinct positive numbers such that for any n > 0, the first nonzero digit of a(n+1)/a(n) is "7".
%C In other words, for any n > 0, we have an integer k such that floor(10^k * a(n+1)/a(n)) = 7.
%H Rémy Sigrist, <a href="/A328758/b328758.txt">Table of n, a(n) for n = 1..10000</a>
%e The first terms, alongside a(n+1)/a(n), are:
%e n a(n) a(n+1)/a(n)
%e -- ---- -----------
%e 1 1 7
%e 2 7 0.714285...
%e 3 5 7
%e 4 35 0.714285...
%e 5 25 0.72
%e 6 18 0.722222...
%e 7 13 0.769230...
%e 8 10 7
%e 9 70 0.7
%e 10 49 0.734693...
%e 11 36 0.722222...
%e 12 26 0.076923...
%Y See A328752 for similar sequences.
%K nonn,base
%O 1,2
%A _Rémy Sigrist_, Oct 27 2019