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A034087
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Numbers divisible by the sum of the squares of their digits.
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11
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1, 10, 20, 50, 100, 110, 111, 120, 130, 133, 200, 210, 240, 267, 298, 310, 315, 360, 372, 376, 400, 420, 480, 500, 532, 550, 630, 803, 917, 973, 1000, 1010, 1011, 1020, 1030, 1071, 1100, 1101, 1110, 1134, 1148, 1200, 1211, 1222, 1290, 1300, 1302, 1316
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OFFSET
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1,2
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LINKS
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FORMULA
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EXAMPLE
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a(100) = 4131 since 4^2+1^2+3^2+1^2=27 divides 4131. - Carmine Suriano, May 04 2013
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MAPLE
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isA034087 := proc(n) if n mod A003132(n) = 0 then true ; else false ; end if ; end proc:
for n from 1 to 1800 do if isA034087(n) then printf("%d ", n) ; end if ; end do ; # R. J. Mathar, Feb 25 2007
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MATHEMATICA
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Select[Range[1500], Divisible[#, Plus @@ (IntegerDigits[#]^2)] &] (* Amiram Eldar, Jan 31 2021 *)
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PROG
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(PARI) isok(m) = !(m % norml2(digits(m))); \\ Michel Marcus, Jan 31 2021
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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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STATUS
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approved
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