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A093320
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a(1) = 1; for m >= 2, a(m) = sum{p|m} a(pi(p)), where the sum is over the distinct prime divisors p of m and pi(p) is the order of p among the primes = the number of primes <= p.
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2
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1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1, 3, 1, 2, 2, 3, 1, 1, 2, 2, 2, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 2, 2, 2, 1, 2, 2, 3, 1, 2, 2, 2, 2, 3, 1, 3, 2, 2, 2, 1, 3, 3, 1, 2, 2, 3, 2, 2, 2, 3, 2, 2, 2, 4, 2, 2, 1, 3, 1, 3, 2, 3, 3, 2, 2, 3, 3, 2, 2, 3, 2, 2, 1, 2, 2, 2, 3, 3, 1, 3, 3
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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MATHEMATICA
| PrimeFactors[n_Integer] := Flatten[ Table[ # [[1]], {1}] & /@ FactorInteger[n]]; a[1] = 1; a[n_] := a[n] = (Plus @@ (a[ # ] & /@ PrimePi[ PrimeFactors[n]])); Table[ a[n], {n, 105}] (from Robert G. Wilson v May 04 2004)
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CROSSREFS
| Cf. A093321, A066328, A094162 (for where n first appears).
Sequence in context: A025909 A025899 A025869 * A082370 A005136 A138474
Adjacent sequences: A093317 A093318 A093319 * A093321 A093322 A093323
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KEYWORD
| nonn,easy
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AUTHOR
| Leroy Quet, Apr 26 2004
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), May 04 2004
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