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A081990
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Numbers k such that both k+1 and (product of digits of k) + 1 are squares.
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3
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3, 8, 24, 35, 168, 528, 624, 783, 1443, 3843, 5183, 7568, 8835, 12543, 13224, 15128, 17423, 24335, 26243, 27224, 41615, 47523, 75624, 87615, 92415, 118335, 128163, 135423, 172224, 213443, 225624, 262143, 265224, 274575, 338723, 345743, 374543
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OFFSET
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1,1
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LINKS
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EXAMPLE
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168 belongs to this sequence as both 1*6*8 + 1 = 49 and 168 + 1 = 169 are squares.
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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EXTENSIONS
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Corrected and extended by Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 06 2003
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STATUS
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approved
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