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Search: id:A075191
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| A075191 |
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Numbers n such that n^3 is an interprime = average of two successive primes. |
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+0
10
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| 4, 12, 16, 26, 28, 36, 48, 58, 66, 68, 74, 78, 102, 106, 112, 117, 124, 126, 129, 130, 148, 152, 170, 174, 184, 189, 190, 192, 224, 273, 280, 297, 321, 324, 369, 372, 373, 399, 408, 410, 421, 426, 429, 435, 447, 449, 450, 470, 475, 496, 504, 507, 531, 537
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Interprimes are in A024675, even interprimes are in A072568, odd interprimes are in A072569 n^2 as interprimes are in A075190, n^4 as interprimes are in A075192, n^5 as interprimes are in A075228, n^6 as interprimes are in A075229, n^7 as interprimes are in A075230, n^8 as interprimes are in A075231, n^9 as interprimes are in A075232, n^10 as interprimes are in A075233, a(n) such that a(n)^n = smallest interprime (of the form a^n) are in A075234.
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EXAMPLE
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4 is a member because 4^3 = 64 is the average of two successive primes 61 and 57.
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MAPLE
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s := 3: for n from 2 to 1000 do if prevprime(n^s)+nextprime(n^s)=2*n^s then print(n) else; fi; od;
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MATHEMATICA
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Select[ Range[548], 2#^3 == PrevPrim[ #^3] + NextPrim[ #^3] &]
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CROSSREFS
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Cf. A024675, A072568, A072569, A075190-A075192, A075228-A075234.
Sequence in context: A057962 A073687 A090818 this_sequence A028594 A152680 A066632
Adjacent sequences: A075188 A075189 A075190 this_sequence A075192 A075193 A075194
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Sep 09 2002
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EXTENSIONS
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Edited by Robert G. Wilson v (rgwv(AT)rgwv.com) Sep 14 2002
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