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A305890
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Filter sequence for all such sequences b, for which b(A176997(k)) = constant for all k > 1, where A176997 is the union of odd primes and Fermat pseudoprimes.
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4
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1, 2, 3, 4, 3, 5, 3, 6, 7, 8, 3, 9, 3, 10, 11, 12, 3, 13, 3, 14, 15, 16, 3, 17, 18, 19, 20, 21, 3, 22, 3, 23, 24, 25, 26, 27, 3, 28, 29, 30, 3, 31, 3, 32, 33, 34, 3, 35, 36, 37, 38, 39, 3, 40, 41, 42, 43, 44, 3, 45, 3, 46, 47, 48, 49, 50, 3, 51, 52, 53, 3, 54, 3, 55, 56, 57, 58, 59, 3, 60, 61, 62, 3, 63, 64, 65, 66, 67, 3, 68, 69, 70, 71, 72, 73, 74, 3
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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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PROG
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(PARI)
up_to = 100000;
A257531(n) = if(n==1, 0, if(Mod(2, n)^(n-1)==1, 1, 0));
partialsums(f, up_to) = { my(v = vector(up_to), s=0); for(i=1, up_to, s += f(i); v[i] = s); (v); }
vpartsums = partialsums(A257531, up_to);
Apartsums(n) = vpartsums[n];
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CROSSREFS
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Differs from A305801 for the first time at n=341, where a(341) = 3, while A305801(341) = 275.
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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