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A102862
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Numbers of prime factors of the sum of the first n primes.
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0
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1, 1, 2, 1, 3, 1, 2, 2, 4, 2, 6, 1, 3, 1, 4, 2, 5, 2, 4, 3, 4, 2, 3, 3, 4, 4, 5, 2, 5, 4, 5, 2, 4, 2, 3, 2, 5, 2, 3, 5, 3, 3, 3, 2, 4, 2, 3, 2, 5, 3, 4, 6, 4, 2, 2, 3, 4, 2, 2, 1, 3, 3, 3, 1, 2, 2, 3, 3, 3, 3, 5, 2, 3, 4, 2, 3, 4, 3, 6, 4, 3, 2, 6, 4, 5, 3, 5, 4, 4, 3, 5, 2, 2, 2, 6, 1, 4, 3, 5, 1, 5, 1, 7, 2, 5
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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EXAMPLE
| a(3)=2 because 2+3+5=10=2*5;
a(5)=3 because 2+3+5+7+11=28=2*2*7.
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PROG
| (PARI) for(n=1, 105, print1(bigomega(sum(k=1, n, prime(k))), ", ")) (Shepherd)
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CROSSREFS
| Sequence in context: A035197 A091948 A161901 * A029331 A037269 A124579
Adjacent sequences: A102859 A102860 A102861 * A102863 A102864 A102865
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KEYWORD
| nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Mar 01 2005
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EXTENSIONS
| More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 17 2005
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