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A332902
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a(1) = 1, then after the first differences of A332809.
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3
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1, 1, 1, 0, 1, 1, 1, -2, 2, 0, 1, 0, 1, 1, 1, -5, 1, 3, 1, -2, 4, -2, 1, -2, 0, 2, -1, 2, 1, 1, 1, -9, 11, -9, 10, -6, 1, 1, 1, -5, 1, 6, 1, -5, 5, -3, 1, -5, 7, -6, 2, 0, 1, -1, 2, -1, 2, 0, 1, 0, 1, 1, 0, -13, 15, 1, 1, -14, 16, -2, 1, -10, 1, 1, 4, -3, 12, -10, 1, -9, 3, -1, 1, 7, -6, 8, 1, -9, 1, 7, 4, -9, 8, -6, 7, -15, 1, 10
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,8
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LINKS
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FORMULA
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a(p) = 1 for all primes p.
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PROG
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(PARI)
up_to = 105;
A332809list(up_to) = { my(v=vector(up_to)); v[1] = Set([1]); for(n=2, up_to, my(f=factor(n)[, 1]~, s=Set([n])); for(i=1, #f, s = setunion(s, v[n-(n/f[i])])); v[n] = s); apply(length, v); }
v332809 = A332809list(up_to);
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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