A103595 Smallest number m such that Sum_{k=1..m} 1/prime(k) >= n/4.

1, 1, 2, 3, 5, 10, 21, 59, 231, 1413, 15474, 361139, 22347214, 4833601540

Offset

1,3

Comments

a(15) > 5*10^10. - Robert Price, Dec 10 2013

Links

Table of n, a(n) for n=1..14.

Mathematica

Table[m = 1; s = 0; While[(s = s + 1/Prime[m]) < n/4, m++];
m, {n, 1, 14}] (* Robert Price, Mar 27 2019 *)

Crossrefs

Cf. A016088, A046024, A103591-A103600.

Sequence in context: A352818 A346970 A001646 * A293842 A014844 A307264

Adjacent sequences: A103592 A103593 A103594 * A103596 A103597 A103598

Keyword

nonn

Author

James R. Buddenhagen, Mar 28 2005

Extensions

a(1) and a(13)-a(14) from Robert Price, Dec 10 2013

Status

approved