Calculate large factorials on a HP48 (SysRPL)

[Dieter]

(02-19-2014 11:45 AM)walter b Wrote:  Personally, I enjoy using the WP 34S for such problems: what is e.g. 5432! ? Returns: 3.022 553 598 4 E17 931. See the description of LNΓ on p. 102, IIRC.

Users without access to a ln Γ function may try one of the Stirling formulas instead. ;-)

BTW, a general caveat regarding methods based on lg n! or ln Γ: Since the exponent 17931 has five digits, at least five mantissa digits of the result are uncertain. On a WP34s in 16-digit SP mode the valid digits are exactly those eleven you posted. Yes, there is a DP option. ;-)

Dieter