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Search: id:A046931
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| A046931 |
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Prime islands: for n >= 2, a(n) = least prime whose adjacent primes are exactly 2n apart; a(1) = 3 by convention. |
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18
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| 3, 5, 7, 29, 23, 53, 89, 223, 113, 331, 631, 211, 1381, 1129, 1637, 4759, 2579, 3433, 4297, 1327, 2179, 2503, 7993, 5623, 9587, 17257, 15859, 14107, 19609, 34981, 36433, 33247, 24281, 35617, 43331, 19661, 134513, 31397, 137029
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..100
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EXAMPLE
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29 is in a sea of 6 composites, namely 24, 25, 26, 27, 28 and 30 and is the smallest such number, so a(3) = 29.
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CROSSREFS
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Related sequences: A023186-A023188, A046929-A046931, A051650, A051652, A051697-A051702, A051728-A051730.
Another version: see A098968 and A098969.
Sequence in context: A061944 A093574 A076846 this_sequence A154551 A058047 A098860
Adjacent sequences: A046928 A046929 A046930 this_sequence A046932 A046933 A046934
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KEYWORD
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nonn,nice
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AUTHOR
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Marc LeBrun (mlb(AT)well.com) and David W. Wilson (davidwwilson(AT)comcast.net)
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