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A117978
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Triangular numbers with only even digits.
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2
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0, 6, 28, 66, 406, 666, 820, 2080, 2628, 8646, 28680, 42486, 48828, 64620, 66066, 80200, 84666, 200028, 204480, 228826, 264628, 288420, 426426, 446040, 468028, 484620, 600060, 626640, 644680, 686206, 828828, 886446, 2222886, 2248260, 2862028, 2888406
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Select[Accumulate[Range[0, 5000]], Count[IntegerDigits[#], _?(OddQ)] ==0&] (* Harvey P. Dale, Oct 21 2011 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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Luc Stevens (lms022(AT)yahoo.com), May 03 2006
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EXTENSIONS
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Corrected (a(32) was in error) and extended by Harvey P. Dale, Oct 21 2011
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STATUS
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approved
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