A077143 -id:A077143 - cp's OEIS frontend

A077144 a(n) = floor(product of next n composite numbers / sum of next n composite numbers).

1, 3, 34, 960, 49500, 3538080, 404020145, 73780761600, 15590323138443, 4627678068946516, 1712182437990539536, 709629581496779727567, 434911027744132649793916, 234745940945367262055489361

Offset: 1

Amarnath Murthy, Oct 30 2002

nonn

Harvey P. Dale, Table of n, a(n) for n = 1..225

Cf. A077143, A077145.

Module[{nn=200,cmps,tr},cmps=Select[Range[nn],CompositeQ];tr=Floor[(Sqrt[8Length[cmps]+1]-1)/2];Floor[(Times@@#)/ Total[ #]]&/@ TakeList[ cmps,Range[tr]]] (* Harvey P. Dale, Nov 03 2024 *)

k=3; for(n=1, 20, p=1; s=0; for(i=1, n, while(isprime(k), k=k+1); p=p*k; s=s+k; k=k+1); print1(floor(p/s)","))

More terms from Ralf Stephan, Mar 24 2003

A077145 a(n) = floor(product of next n primes / product of next n composite numbers).

Original entry on oeis.org

0, 0, 0, 3, 17, 106, 590, 3090, 21092, 127889, 734604, 6252468, 32854824, 279387963, 1909105118, 12319099520, 95059552565, 740652053314, 4888570540807, 40743793439712, 307640708818550, 2379664631112651, 17269477509704034, 165628134793721883

Offset: 1

Amarnath Murthy, Oct 30 2002

nonn

Cf. A007467, A071221.

Cf. A077143, A077144.

a(n) = floor(A007467(n)/A071221(n)). - Michel Marcus, May 08 2025

a(7)-a(9) from Donald Sampson (marsquo(AT)hotmail.com), Dec 08 2003

More terms from Sean A. Irvine, May 07 2025

cp's OEIS Frontend

A077144 a(n) = floor(product of next n composite numbers / sum of next n composite numbers).

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