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 A247626 Knife numbers (third version): n=concat(a,b) is divisible by a+b; a>0, b may have leading zeros. 3
 10, 12, 18, 20, 21, 24, 27, 30, 36, 40, 42, 45, 48, 50, 54, 60, 63, 70, 72, 80, 81, 84, 90, 100, 102, 105, 108, 110, 120, 126, 130, 132, 140, 144, 147, 150, 160, 162, 168, 170, 180, 189, 190, 198, 200, 201, 204, 207, 209, 210, 216, 220, 230, 231, 240, 243, 250, 260, 264, 270, 280, 288, 290, 297, 300, 306, 308, 310, 320, 324, 330, 340 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See subsequences A247624, A247625 and A247627 for more restrictive definitions, excluding, e.g., leading zeros in b. LINKS Table of n, a(n) for n=1..72. E. Angelini, Knife numbers. PROG (PARI) is(n)=n&&for(k=1, #Str(n)-1, n%([1, 1]*divrem(n, 10^k))||return(1)) CROSSREFS Sequence in context: A265043 A158871 A359074 * A247627 A327709 A129120 Adjacent sequences: A247623 A247624 A247625 * A247627 A247628 A247629 KEYWORD nonn,base AUTHOR M. F. Hasler and Eric Angelini, Sep 21 2014 STATUS approved

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Last modified September 18 14:24 EDT 2024. Contains 376000 sequences. (Running on oeis4.)