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A103595 Smallest number m such that Sum_{k=1..m} 1/prime(k) >= n/4. 1
1, 1, 2, 3, 5, 10, 21, 59, 231, 1413, 15474, 361139, 22347214, 4833601540 (list; graph; refs; listen; history; text; internal format)
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: A218532 A022861 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

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Last modified June 7 02:48 EDT 2020. Contains 334836 sequences. (Running on oeis4.)