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A202358
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Sum of digits of n^(n!).
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1
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0, 1, 4, 18, 73, 334, 2592, 18919, 164476, 1558521, 1, 187044031, 2326111614, 31214008090
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OFFSET
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0,3
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COMMENTS
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LINKS
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FORMULA
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EXAMPLE
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a(3) = 18 because 3^3! = 729 with digit sum 7+2+9 = 18.
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MAPLE
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ds:= proc(n) local r;
`if`(n<10, n, ds(iquo(n, 10^iquo(length(n), 2), 'r'))+ds(r))
end:
a:= n-> ds(n^n!):
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PROG
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(Python)
from math import factorial
def a(n): return sum(map(int, str(n**(factorial(n)))))
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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