OFFSET
1,2
COMMENTS
LINKS
Jaroslav Krizek, Table of n, a(n) for n = 1..411 (complete list)
FORMULA
A178788(a(n)) = 1.
MATHEMATICA
nnddQ[n_]:=!PrimeQ[n]&&Max[DigitCount[n]]<2&&Min[Differences[ IntegerDigits[ n]]]>0; Select[Range[300], nnddQ] (* Harvey P. Dale, Sep 27 2020 *)
CROSSREFS
KEYWORD
nonn,base,fini
AUTHOR
Jaroslav Krizek, May 07 2012
STATUS
approved