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A086519
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a(n) is the least prime not already used such that (a(n)+a(n-1))/2 is prime.
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5
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3, 7, 19, 43, 31, 103, 151, 67, 79, 127, 199, 163, 139, 223, 331, 211, 271, 283, 379, 367, 307, 439, 487, 607, 547, 499, 643, 571, 523, 619, 463, 631, 691, 727, 739, 883, 823, 751, 787, 859, 907, 811, 1063, 919, 1123, 1051, 967, 1171, 1087, 991, 1471, 1291
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Second term onwards every prime == 1 (mod 6). Conjecture: every prime of the type 6k+1 is a member.
After the first term, every member = 7 (mod 12). Conjecture: every prime of the form 12k+7 is a member. - David Wasserman (wasserma(AT)spawar.navy.mil), Mar 11 2005
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CROSSREFS
| Cf. A086522.
Sequence in context: A047025 A173114 A163572 * A090689 A145476 A126938
Adjacent sequences: A086516 A086517 A086518 * A086520 A086521 A086522
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 30 2003
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Mar 11 2005
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