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Search: id:A163634
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A163634 a(n) = (p*(p+4)+1)/2 where (p,p+4) are the n-th cousin prime pair. +0
1
11, 39, 111, 219, 759, 1011, 2379, 3279, 4899, 5511, 6159, 8319, 13611, 19011, 25311, 26679, 38919, 47739, 49611, 61599, 72579, 79599, 97239, 105339, 108111, 119559, 125499, 189111, 208011, 227811, 274539, 288039, 297219, 340311, 365511, 370659 (list; graph; listen)
OFFSET

1,1

FORMULA

a(n)=(A143206(n)+1)/2.

EXAMPLE

a(1)=(3*7+1)/2=11. a(2)=(7*11+1)/2. a(3)=(13*17+1)/2.

CROSSREFS

Cf. A023200, A046132.

Sequence in context: A045801 A162261 A004188 this_sequence A127867 A138050 A077568

Adjacent sequences: A163631 A163632 A163633 this_sequence A163635 A163636 A163637

KEYWORD

nonn

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)ti.it), Aug 02 2009

EXTENSIONS

Entries checked by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 07 2009

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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