A114488 Number of decimal digits in (10^n)!!.

1, 4, 80, 1285, 17831, 228289, 2782857, 32828532, 378285281, 4282852764, 47828527596, 528285275911, 5782852759055, 62828527590491, 678285275904845, 7282852759048382, 77828527590483750

Offset

0,2

Links

Table of n, a(n) for n=0..16.

Eric Weisstein's World of Mathematics, Double Factorial

Crossrefs

Cf. A006882.

Sequence in context: A269146 A192834 A054322 * A055787 A132584 A277074

Adjacent sequences: A114485 A114486 A114487 * A114489 A114490 A114491

Keyword

nonn,base,changed

Author

Eric W. Weisstein, Nov 30 2005

Status

approved