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.

7, 19, 321, 139307, 262365, 264245, 528577

Offset: 1

Author

Antti Karttunen, Aug 06 2023

Keywords

• nonn
• more

Examples

			     k   A005940(k)   A005940(k)/k  A005940(k)-k
     7         9      1.285714286        2
    19        21      1.105263158        2
   321       323      1.006230530        2
139307    139965      1.004723381      658
262365    263375      1.003849599     1010
264245    264845      1.002270620      600
528577    528581      1.000007567        4.
		

Crossrefs

Cf. A005940.

Cf. also A364573, A364576.

Programs

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, ", ")))