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A060980
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|First digit - second digit + third digit - fourth digit ...| = 12.
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27
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309, 408, 419, 507, 518, 529, 606, 617, 628, 639, 705, 716, 727, 738, 749, 804, 815, 826, 837, 848, 859, 903, 914, 925, 936, 947, 958, 969, 1409, 1508, 1519, 1607, 1618, 1629, 1706, 1717, 1728, 1739, 1805, 1816, 1827, 1838, 1849, 1904, 1915, 1926, 1937
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Harvey P. Dale, Table of n, a(n) for n = 1..1000
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MATHEMATICA
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Do[ a = IntegerDigits[ n ]; l = Length[ a ]; e = o = {}; Do[ o = Append[ o, a[ [ 2k - 1 ] ] ], {k, 1, l/2 + .5} ]; Do[ e = Append[ e, a[ [ 2k ] ] ], {k, 1, l/2} ]; If[ Abs[ Apply[ Plus, o ] - Apply[ Plus, e ] ] == 12, Print[ n ] ], {n, 1, 2000} ]
Select[Range[2000], Abs[Total[Times@@@Partition[Riffle[IntegerDigits[#], {1, -1}, {2, -1, 2}], 2]]]==12&] (* Harvey P. Dale, Sep 12 2017 *)
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CROSSREFS
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Cf. A008593, A060978-A060980, A060982, A061470-A061479, A061870-A061882.
Sequence in context: A091552 A159004 A031782 * A061881 A121322 A067730
Adjacent sequences: A060977 A060978 A060979 * A060981 A060982 A060983
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KEYWORD
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base,nonn,easy
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AUTHOR
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Robert G. Wilson v, May 10 2001
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STATUS
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approved
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