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A124069
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Fixed points for operation of repeatedly replacing a number with the sum of the eighth power of its digits.
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8
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OFFSET
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1,3
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COMMENTS
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This is row n=8 of A252648. For a d-digit number n >= 10^(d-1), the sum of 8th powers of its digits is <= 9^8*d, therefore n <= 413979400. - M. F. Hasler, Apr 12 2015
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LINKS
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FORMULA
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EXAMPLE
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24678050 = 2^8 + 4^8 + 6^8 + 7^8 + 8^8 + 0^8 + 5^8 + 0^8.
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PROG
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(PARI) isok(n) = my(d = digits(n)); sum(k=1, #d, d[k]^8) == n; \\ Michel Marcus, Feb 21 2015
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CROSSREFS
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KEYWORD
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base,fini,full,nonn
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AUTHOR
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STATUS
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approved
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