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Revision History for A359550
(Bold, blue-underlined text is an addition; faded, red-underlined text is aShowing entries 1-10 | older changes
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proposed
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LINKS
<a href="/index/Ch#char_fns">Index entries for characteristic functions</a>.
FORMULA
Sum_{k=1..n} a(k) ~ c * n, where c = Product_{p prime} (1 - 1/p^p) = 0.7219902344... . - Amiram Eldar, Jan 07 2023
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NAME
Multiplicative with a(p^e) = 1 if e < p, > e, otherwise 0.
LINKS
Antti Karttunen, <a href="/A359550/b359550.txt">Table of n, a(n) for n = 1..100000</a>
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approved
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PROG
(Python)
from sympy import factorint
def A359550(n): return int(all(map(lambda d:d[0]>d[1], factorint(n).items()))) # Chai Wah Wu, Jan 06 2023
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approved
editing