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A268610
Indices of records in A004290.
1
1, 2, 3, 6, 9, 18, 36, 72, 99, 198, 396, 792, 999, 1998, 3996, 7992, 9999, 10989, 19998, 21978, 39996, 43956, 76923, 99999, 199998
OFFSET
1,2
COMMENTS
a(n+1) <= 2*a(n) for all n >= 2.
EXAMPLE
6 is a term because A004290(n) < A004290(6) for all n < 6, where A004290(n) is the least positive multiple of n that when written in base 10 uses only 0's and 1's.
PROG
(PARI) lista(nn) = {my(k, r=0); for(n=1, nn, k=1; while(fromdigits(binary(k))%n>0, k++); if(k>r, r=k; print1(n, ", "))); } \\ Jinyuan Wang, May 16 2020; a(1)=0 inserted by Georg Fischer, Jun 24 2020; a(1)=0 removed again by David A. Corneth, Feb 19 2024
CROSSREFS
Sequence in context: A085431 A108862 A298413 * A018582 A018619 A018638
KEYWORD
nonn,base,more
AUTHOR
David Radcliffe, Feb 08 2016
EXTENSIONS
a(1)=0 inserted by Georg Fischer, Jun 24 2020
Initial 0 removed for consistency with change in A004290 by Sean A. Irvine, Feb 19 2024
STATUS
approved