A147550 Smallest n-digit number m such that phi(m) is minimal.

1, 10, 102, 1050, 10080, 101010, 1021020, 10210200, 100150050, 1009788780, 10039179150, 100614884370, 1002802450650, 10028024506500, 100093293239940, 1003203571630260, 10040258696397930, 100098336700452090, 1004819888620217670, 10034477941390913010, 100227034561924099830, 1004115014967006472530, 10014709889018759594670

Offset

1,2

Comments

For all n, A147551(n) = phi(a(n)).

Links

Max Alekseyev, Table of n, a(n) for n = 1..31

Example

phi(10)=4 and there is no 2-digit number t such that phi(t)<4 so a(2)=10.
phi(102)=32 and there is no 3-digit number t such that phi(t)<32 also phi(100) and phi(101) are greater than 32, so a(3)=102.

Crossrefs

Cf. A147551.

Sequence in context: A158242 A147636 A191014 * A162666 A061630 A062806

Adjacent sequences: A147547 A147548 A147549 * A147551 A147552 A147553

Keyword

base,nonn

Author

Farideh Firoozbakht, Nov 22 2008

Extensions

a(11)-a(31) from Max Alekseyev, Feb 02 2012, Feb 14 2018

Status

approved