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Search: id:A120312
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| A120312 |
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Numbers whose PrimePi prime distribution are four apart and which index primes of the 4*k+1 type ( correction). |
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+0
1
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| 7, 10, 21, 37, 40, 53, 55, 57, 71, 89, 108, 134, 135, 136, 151, 152, 174, 176, 178, 194, 196
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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a(n) = If[Mod[PrimePi[n], 4] == 0&& Mod[Prime[n], 4] - 1 == 0, n]
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MATHEMATICA
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a = Flatten[Table[If[Mod[PrimePi[n], 4] == 0&& Mod[Prime[n], 4] - 1 == 0, n, {}], {n, 1, 200}]]
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CROSSREFS
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Sequence in context: A122226 A064210 A097634 this_sequence A074377 A117618 A103119
Adjacent sequences: A120309 A120310 A120311 this_sequence A120313 A120314 A120315
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KEYWORD
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nonn,uned
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Jun 20 2006
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EXTENSIONS
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Needs to be edited in the same way that I edited A120309. - N. J. A. Sloane (njas(AT)research.att.com), Jul 22 2006
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