A060250 The smallest k such that k! + 1 has exactly n prime factors (with multiplicity).

1, 4, 9, 23, 16, 18, 40, 89

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Mathematica

With[{f=PrimeOmega[Range[90]!+1]}, Table[Position[f, _?(#==n&), 1, 1], {n, 8}]]//Flatten (* Harvey P. Dale, Feb 11 2018 *)

Prog

(PARI) a(n)=my(k); while(bigomega(k++!+1)-n, ); k \\ Charles R Greathouse IV, Apr 25 2012

Crossrefs

Cf. A054990.

Sequence in context: A370021 A374055 A070713 * A138991 A361002 A138990

Adjacent sequences: A060247 A060248 A060249 * A060251 A060252 A060253

Keyword

nonn,more

Author

Robert G. Wilson v, Mar 23 2001

Extensions

a(8) from Arkadiusz Wesolowski, Apr 25 2012

Title clarified by Sean A. Irvine, Nov 02 2022

Status

approved