OFFSET
1,1
COMMENTS
From 2nd terms onwards it is observed that if a(r) ends in k then a(r+1) begins with k+1. This is true up to the term 90919293949596. (Why?)
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[FromDigits[Flatten[IntegerDigits[#]]]&/@Partition[Range[100], 7, 1], Divisible[ #, 7]&] (* Harvey P. Dale, May 18 2021 *)
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Apr 11 2003
STATUS
approved