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Search: id:A088423
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| A088423 |
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Number of primes in arithmetic progression starting with 11 and with d=2n. |
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+0
10
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| 2, 1, 4, 2, 1, 2, 1, 1, 3, 2, 1, 1, 2, 1, 5, 2, 1, 3, 1, 1, 2, 1, 1, 3, 2, 1, 1, 2, 1, 6, 2, 1, 1, 2, 1, 2, 1, 1, 3, 1, 1, 1, 2, 1, 4, 2, 1, 2, 2, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 1, 4, 2, 1, 1, 1, 1, 2, 2, 1, 1, 2, 1, 1, 2, 1, 2, 1, 1, 2, 1, 1, 3, 2, 1, 1, 1, 1, 2, 2, 1, 4, 2, 1, 1, 1, 1, 1, 2
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Arithmetic progression is stopped when next term is not prime. E.g. for n=3, a=4, that is 11,17,23,29 are prime, while next term, 35, is not prime.
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MATHEMATICA
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bb={}; Do[s=1; Do[If[PrimeQ[11+k*d], s=s+1, bb={bb, s}; Break[]], {k, 10}], {d, 2, 200, 2}]; Flatten[bb]
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CROSSREFS
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Cf. A088420, A088421, A088422, A088424, A088425, A088426, A088427, A088428, A088429.
Sequence in context: A007739 A031424 A013942 this_sequence A006839 A118235 A083653
Adjacent sequences: A088420 A088421 A088422 this_sequence A088424 A088425 A088426
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 29 2003
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