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Search: id:A089698
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| A089698 |
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Largest n-digit number k such that k+1 as well as the product of digits of k + 1 are squares greater than 1. |
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+0
2
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| 8, 35, 783, 8835, 92415, 956483, 9634815, 95413823, 941385123, 9857511224, 99575589135, 993574355523, 9553625719235, 99581119573155, 992553557213123, 9535746315113315
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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readlib(issqr): Digits:=100: for d from 1 to 15 do for n from floor(sqrt(10^d)) by -1 to ceil(sqrt(10^(d-1)+1)) do m:=mul(j, j=convert(n^2-1, base, 10)): if m<>0 and issqr(m+1) then printf("%d, ", n^2-1): break fi od od: (C. Ronaldo)
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CROSSREFS
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Cf. A081990, A089697.
Sequence in context: A114569 A098999 A000426 this_sequence A133887 A057345 A048740
Adjacent sequences: A089695 A089696 A089697 this_sequence A089699 A089700 A089701
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 10 2003
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EXTENSIONS
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More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 25 2004
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