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A132208
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a(n) = 11+30n(n+1)/2.
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0
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11, 41, 101, 191, 311, 461, 641, 851, 1091, 1361, 1661, 1991, 2351, 2741, 3161, 3611, 4091, 4601, 5141, 5711, 6311, 6941, 7601, 8291, 9011, 9761, 10541, 11351, 12191
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| The sequence starts with a string of primes for indices n = 0 to 6. a(n=7)=851 is composite, n=8 to 9 are prime, n=10 to 11 are composite etc. with an irregular pattern of primes/composites.
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EXAMPLE
| p=30(0)+11
p=11
p=30(1)+11
p=41
p=30(2)+41
p=101
etc.
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CROSSREFS
| Sequence in context: A158187 A065145 A030685 * A066595 A195117 A027086
Adjacent sequences: A132205 A132206 A132207 * A132209 A132210 A132211
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KEYWORD
| nonn
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AUTHOR
| Nate Eskey (nj.eskey09(AT)bchigh.edu), Nov 06 2007
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EXTENSIONS
| Better definition from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 16 2007
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