cp's OEIS Frontend

A364572 Starting from k=7, each subsequent term is the next larger odd k such that A005940(k) >= k and the ratio A005940(k)/k is nearer to 1.0 than for any previous k in the sequence.

%I A364572 #17 Aug 06 2023 17:50:52
%S A364572 7,19,321,139307,262365,264245,528577
%N A364572 Starting from k=7, each subsequent term is the next larger odd k such that A005940(k) >= k and the ratio A005940(k)/k is nearer to 1.0 than for any previous k in the sequence.
%e A364572      k   A005940(k)   A005940(k)/k  A005940(k)-k
%e A364572      7         9      1.285714286        2
%e A364572     19        21      1.105263158        2
%e A364572    321       323      1.006230530        2
%e A364572 139307    139965      1.004723381      658
%e A364572 262365    263375      1.003849599     1010
%e A364572 264245    264845      1.002270620      600
%e A364572 528577    528581      1.000007567        4.
%o A364572 (PARI) print1(7,", "); r = A005940(7)/7; forstep(n=7,1+(2^26),2,t=A005940(n)/n; if(t>=1 && t < r, r=t;print1(n, ", ")))
%Y A364572 Cf. A005940.
%Y A364572 Cf. also A364573, A364576.
%K A364572 nonn,more
%O A364572 1,1
%A A364572 _Antti Karttunen_, Aug 06 2023