OFFSET
1,1
COMMENTS
These may not contain 1 or have a 2 or 5 as the last digit. They include prime numbers not containing the digit 1 and composites with a smallest prime factor > 10 and obeying the other constraints (e.g. the largest case is 987654203 = 31×31859813.)
The first even case is 34. The first consecutive pair is {37, 38}. {56,57,58,59} is a consecutive quadruple which is the maximal size for such a subset.
There are 202623 terms in this sequence. - Nathaniel Johnston, May 19 2011
LINKS
Nathaniel Johnston, Table of n, a(n) for n = 1..10000
MATHEMATICA
dddQ[n_]:=Module[{dcn=DigitCount[n]}, Max[dcn]==1&&First[dcn]==0 && Union[ Divisible[n, Select[IntegerDigits[n], #!=0&]]]=={False}]; Select[Range[ 400], dddQ] (* Harvey P. Dale, May 01 2012 *)
CROSSREFS
KEYWORD
nonn,easy,base,fini
AUTHOR
Andy Edwards, Mar 31 2011
STATUS
approved