A038803 Largest number with n prime factors of lengths 1, ..., n.

7, 679, 676963, 6751351999, 675074437732009, 675062961466567555847, 6750623539099022359361997377, 675062279653043305846953784718028853, 675062237124119687705225516359940415764182261, 6750622348964143051956305469326962117763788889781985387

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..45

Formula

a(n) = Product_{k=1..n} prev_prime(10^k). - Sean A. Irvine, Feb 14 2021

Maple

r:= 1: R:= NULL:
for n from 1 to 12 do
r:= r * prevprime(10^n);
R:= R, r;
od:
R; # Robert Israel, Apr 17 2026

Crossrefs

Sequence in context: A174853 A228928 A332167 * A144957 A163016 A261696

Adjacent sequences: A038800 A038801 A038802 * A038804 A038805 A038806

Keyword

base,nonn

Author

Jeff Burch

Extensions

a(10) and typos in terms corrected by Sean A. Irvine, Feb 14 2021

Definition corrected by Robert Israel, Apr 17 2026

Status

approved