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A247625
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Knife numbers (second version): n=concat(a,b) is divisible by a+b; a>0; b must not have leading zeros.
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3
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12, 18, 21, 24, 27, 36, 42, 45, 48, 54, 63, 72, 81, 84, 102, 105, 108, 110, 126, 132, 144, 147, 162, 168, 189, 198, 201, 204, 207, 209, 216, 220, 231, 243, 264, 288, 297, 306, 308, 324, 330, 396, 402, 405, 407, 408, 414, 418, 429, 432, 440, 462, 486, 495, 504, 506, 510, 528, 540, 550, 567, 594, 603, 605, 612, 616, 621, 627, 648
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OFFSET
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1,1
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COMMENTS
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Here, b must not have leading zeros but may be zero, in contrast to the subsequence A247624 and the alternate variant A247627. Sequence A247626 is less restrictive, allowing leading zeros in b.
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LINKS
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PROG
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(PARI) is(n, u=[1, 1])=n&&for(k=1, #Str(n)-1, n%(u*divrem(n, 10^k))==0&&(n%10^k)&&return(1))
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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