A060323 The first k digits of k! form a prime number.

43, 93, 808, 2057, 3247, 13557

Offset

1,1

Comments

The primality of the number formed by the first a(4) digits of a(4)! was established by Andrey V. Kulsha and Peter Liaskovsky (ALTAIR(AT)tut.by).

a(7) > 30000. - Donovan Johnson, Mar 29 2010

a(7) > 100000. - Michael S. Branicky, Jan 25 2026

Links

Table of n, a(n) for n=1..6.

Crossrefs

Sequence in context: A306114 A044181 A044562 * A141958 A141990 A253952

Adjacent sequences: A060320 A060321 A060322 * A060324 A060325 A060326

Keyword

nonn,base,hard,more

Author

G. L. Honaker, Jr., Mar 29 2001

Extensions

a(5)-a(6) from Donovan Johnson, Mar 29 2010

Status

approved