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Search: id:A164580
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| A164580 |
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Primes of the form p^2 + (p+1)/2 where p is also prime. |
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+0
2
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| 11, 53, 127, 541, 977, 1871, 3511, 4523, 5077, 11503, 16193, 19391, 22877, 57241, 63127, 80231, 129061, 134873, 143831, 229681, 241327, 344863, 359101, 398477, 418933, 434611, 619763, 658127, 745201, 845021, 966781, 982577, 1063477, 1130501, 1371827
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OFFSET
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1,1
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FORMULA
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a(n) = (A154427(n))^2 + ( A154427(n)+1)/2.
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EXAMPLE
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For p=3, p^2+(p+1)/2=11, prime, which adds 11 to the sequence. For p=7, p^2+(p+1)/2=53, which adds 53 to the sequence.
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CROSSREFS
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Cf. A154427
Sequence in context: A004622 A045471 A086715 this_sequence A141893 A093198 A093864
Adjacent sequences: A164577 A164578 A164579 this_sequence A164581 A164582 A164583
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 17 2009
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EXTENSIONS
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Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 26 2009
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