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Search: id:A101436
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| A101436 |
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Number of exponents in prime factorization of n which are primes. |
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+0
2
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| 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 2, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 1, 2, 0, 0, 0, 1, 0
(list; graph; listen)
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OFFSET
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1,36
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COMMENT
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First occurrence of k: 1,4,36,900,44100 (A061742). - Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 25 2005
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EXAMPLE
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36 = 2^2 *3^2. Since 2 is a prime and occurs twice as an exponent in the prime factorization of 36, a(36) = 2.
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MATHEMATICA
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f[n_] := Length[ Select[ Flatten[ Table[ #[[2]], {1}] & /@ FactorInteger[n]], PrimeQ[ # ] &]]; Table[ f[n], {n, 105}] (from Robert G. Wilson v Jan 25 2005)
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CROSSREFS
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Sequence in context: A024326 A133698 A093956 this_sequence A056170 A059483 A067618
Adjacent sequences: A101433 A101434 A101435 this_sequence A101437 A101438 A101439
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jan 18 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 25 2005
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