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A105179
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Numbers having in decimal representation the same final digit as their largest proper divisor has.
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0
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1, 11, 15, 20, 25, 31, 40, 41, 45, 60, 61, 71, 75, 80, 100, 101, 105, 120, 121, 125, 131, 135, 140, 143, 151, 160, 165, 175, 180, 181, 187, 191, 195, 200, 209, 211, 220, 225, 240, 241, 251, 253, 255, 260, 271, 275, 280, 281, 285, 300, 311, 315, 319, 320, 325
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| A010879(A032742(a(n))) = A010879(a(n));
A008602 is a subsequence apart from the initial term;
A030430 is a subsequence.
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EXAMPLE
| n=105=3*35 and 105 == 35 modulo 10, therefore 105 is a term.
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MATHEMATICA
| Join[{1}, Select[Range[2, 400], Last[IntegerDigits[Divisors[#][[-2]]]] == Last[IntegerDigits[#]]&]] (* From Harvey P. Dale, Apr 21 2011 *)
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CROSSREFS
| Sequence in context: A053675 A031944 A049354 * A120156 A087682 A104628
Adjacent sequences: A105176 A105177 A105178 * A105180 A105181 A105182
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KEYWORD
| nonn,base
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 29 2005
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