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A200050 a(2) = 1, then (p-1)*(p-4)/2, with p = prime(n), n > 2. 2

%I

%S 1,2,9,35,54,104,135,209,350,405,594,740,819,989,1274,1595,1710,2079,

%T 2345,2484,2925,3239,3740,4464,4850,5049,5459,5670,6104,7749,8255,

%U 9044,9315,10730,11025,11934,12879,13529,14534,15575,15930,17765,18144,18914,19305

%N a(2) = 1, then (p-1)*(p-4)/2, with p = prime(n), n > 2.

%C Record values in A192599. The index sequence of this one is 1, 2, 3, 6, 7, 9, 11, 13, 17, 18, 21, 23, 25, 29, 31, 34, 36, 40, 42, 45, 47, 50, 52, 56, 58, 61.

%H Arkadiusz Wesolowski, <a href="/A200050/b200050.txt">Table of n, a(n) for n = 2..10000</a>

%F a(2) = 1, a(n) = A006093(n)*A172367(n-2)/2.

%e A192599(13) = 209 since A192599(17) = 350 is the next record value.

%t Table[p = Prime[n + 1]; (p - 1)*Abs[p - 4]/2, {n, 45}]

%t Join[{1},((#-1)(#-4))/2&/@Prime[Range[3,50]]] (* _Harvey P. Dale_, Aug 04 2020 *)

%o (MAGMA) [(p-1)*Abs(p-4)/2: p in [NthPrime(n+1): n in [1..45]]]

%o (PARI) vector(45, n, p=prime(n+1); (p-1)*abs(p-4)/2)

%Y Cf. A000096, A014107, A192599.

%K nonn

%O 2,2

%A _Arkadiusz Wesolowski_, Apr 16 2012

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Last modified January 20 15:21 EST 2021. Contains 340302 sequences. (Running on oeis4.)