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
p333Q[n_] := Module[{idn = IntegerDigits[n]}, MemberQ[Partition[idn, 3, 1], {3, 3, 3}]]; Select[Prime[Range[20000]], p333Q] (* Vincenzo Librandi Sep 14 2012 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Vincenzo Librandi, Nov 01 2009
STATUS
approved