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 A163083 Primes of the form k\$ + 1 which are the greater of twin primes. Here '\$' denotes the swinging factorial function (A056040). 3
 7, 31, 51481, 1580132580471901 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Subsequence of A163075 and of A006512. LINKS Jinyuan Wang, Table of n, a(n) for n = 1..5 Peter Luschny, Swinging Primes. MAPLE a := proc(n) select(s->isprime(s) and isprime(s-2), map(k -> A056040(k)+1, [\$4..n])) end: MATHEMATICA sf[n_] := With[{f = Floor[n/2]}, Pochhammer[f+1, n-f]/f!]; Do[ If[ PrimeQ[p = sf[n] + 1] && PrimeQ[p - 2], Print["n = ", n, " p = ", p]], {n, 1, 400}] (* Jean-François Alcover, Jul 29 2013 *) CROSSREFS Cf. A056040, A006512, A163075. Sequence in context: A134709 A139314 A290969 * A101329 A193637 A214490 Adjacent sequences: A163080 A163081 A163082 * A163084 A163085 A163086 KEYWORD nonn AUTHOR Peter Luschny, Jul 21 2009 STATUS approved

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Last modified February 24 22:04 EST 2024. Contains 370307 sequences. (Running on oeis4.)