

A110071


Numbers n such that n=pi(d_1!!*d_2!!*...*d_k!!) where d_1 d_2 ... d_k is the decimal expansion of n.


2




OFFSET

1,2


COMMENTS

There is no further term up to 73*10^6.  Farideh Firoozbakht, Dec 02 2007


LINKS

Table of n, a(n) for n=1..5.


EXAMPLE

11387 is in the sequence because 11387=pi(1!!*1!!*3!!*8!!*7!!).


MATHEMATICA

Do[h = IntegerDigits[n]; l = Length[h]; If[n == PrimePi[ Product[h[[k]]!!, {k, l}]], Print[n]], {n, 0, 50000}]


CROSSREFS

Cf. A097655, A110070, A110072.
Sequence in context: A110816 A112322 A281535 * A256703 A176432 A278924
Adjacent sequences: A110068 A110069 A110070 * A110072 A110073 A110074


KEYWORD

base,hard,more,nonn


AUTHOR

Farideh Firoozbakht, Jul 22 2005


EXTENSIONS

1656281 added by Farideh Firoozbakht, Dec 02 2007


STATUS

approved



