This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A121042 Smallest divisor of n that is also contained in the decimal representation of n. 2
 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 23, 2, 5, 2, 27, 2, 29, 3, 1, 2, 3, 34, 5, 3, 37, 38, 3, 4, 1, 2, 43, 4, 5, 46, 47, 4, 49, 5, 1, 2, 53, 54, 5, 56, 57, 58, 59, 6, 1, 2, 3, 4, 5, 6, 67, 68, 69, 7, 1, 2, 73, 74, 5, 76, 7, 78, 79, 8, 1, 2, 83, 4, 5, 86, 87, 8, 89, 9, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 1 <= a(n) <= n; a(A011531(n)) = 1; a(n) = n iff A121041(n) = 1. a(n) = 1 for almost all n (measure 1). - Charles R Greathouse IV, Mar 31 2016 LINKS EXAMPLE a(48) = Min{4, 8, 48} = 4; a(49) = Min{49} = 49; a(120) = Min{1, 2, 12, 20, 120} = 1; a(121) = Min{1} = 1. PROG (PARI) substr(a, b)=a=digits(a); b=digits(b); for(i=0, #a-#b, for(j=1, #b, if(a[i+j]!=b[j], next(2))); return(1)); 0 a(n)=fordiv(n, d, if(substr(n, d), return(d))) \\ Charles R Greathouse IV, Mar 31 2016 CROSSREFS Sequence in context: A256229 A052423 A126616 * A000030 A179635 A306354 Adjacent sequences:  A121039 A121040 A121041 * A121043 A121044 A121045 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Jul 21 2006 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 21 22:47 EDT 2019. Contains 328315 sequences. (Running on oeis4.)