A167281 Primes containing the string 555.

5557, 15551, 15559, 45553, 45557, 55501, 55511, 55529, 55541, 55547, 55579, 55589, 65551, 65557, 75553, 75557, 105557, 115553, 125551, 135559, 155501, 155509, 155521, 155537, 155539, 155557, 155569, 155579, 155581, 155593, 155599, 165551

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Formula

a(n) ~ n log n. - Charles R Greathouse IV, Nov 01 2022

Mathematica

p555Q[n_] := Module[{idn=IntegerDigits[n]}, MemberQ[Partition[idn, 3, 1], {5, 5, 5}]]; Select[Prime[Range[16000]], p555Q] (* Vincenzo Librandi, Sep 15 2013 *)

Crossrefs

Cf. A166571-A166573, A166579-A166582.

Sequence in context: A203336 A045104 A043512 * A252907 A300818 A252154

Adjacent sequences: A167278 A167279 A167280 * A167282 A167283 A167284

Keyword

nonn,base

Author

Vincenzo Librandi, Nov 01 2009

Status

approved