login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A160040 Numbers n such that pi(n) = prime(d_1)*prime(d_2)* ... *prime(d_k), where d_1, d_2, ... d_k is the decimal expansion of n, and the zeroth prime is 1. 2
123, 2407, 5224, 8350, 11166, 30843, 51174, 66026, 172451, 202774, 266109, 546322, 1082682, 1830188, 1882036, 2754207, 3351809, 14355351, 23539612, 23539621, 24322837, 63950931, 122924349, 161485470, 204868903, 204868930, 252704792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

See the references in A008578 for a discussion concerning the zeroth prime.

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..66 (n = 1..31 from Robert G. Wilson v)

MATHEMATICA

c = 0; k = 1; lst = {}; fQ[n_] := ( c == Times @@ (IntegerDigits@ n /. {0 -> 1, 1 -> 2, 2 -> 3, 3 -> 5, 4 -> 7, 5 -> 11, 6 -> 13, 7 -> 17, 8 -> 19, 9 -> 23}) ); While[k < 6000000000, If[PrimeQ@k, c++, If[ fQ@k, AppendTo[lst, k]; Print@k]]; k++ ]; lst

CROSSREFS

Cf. A008578, A113581. A098683 is a proper subset.

Sequence in context: A115983 A202132 A167231 * A297524 A163711 A293309

Adjacent sequences:  A160037 A160038 A160039 * A160041 A160042 A160043

KEYWORD

nonn,base

AUTHOR

Robert G. Wilson v, Apr 30 2009

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 16 18:07 EST 2022. Contains 350376 sequences. (Running on oeis4.)