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A076475 Primes in the numerator of the slowest decreasing sequence of unit fractions whose partial sums have a prime numerator. 1

%I #3 Mar 30 2012 17:22:26

%S 3,11,61,11,23,263,3529,75539,1767427,2394941,70374209,638709217,

%T 1287433439,6485239219,111050267123,5926525377919,17899889727157,

%U 342263549497183,344391855476983,346449217924123,348264537730423

%N Primes in the numerator of the slowest decreasing sequence of unit fractions whose partial sums have a prime numerator.

%C Note that the primes are not necessarily increasing.

%t nMax = 100; lst = {1}; numer = {1}; s = 1; i = 2; Do[While[ ! PrimeQ[Numerator[s + 1/i]], i++ ]; s = s + 1/i; AppendTo[lst, i]; AppendTo[numer, Numerator[s]]; i++, {n, 2, nMax}]; numer

%Y Cf. A076474.

%K nonn

%O 2,1

%A _T. D. Noe_, Oct 14 2002

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Last modified April 19 21:09 EDT 2024. Contains 371798 sequences. (Running on oeis4.)