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

1, 2, 9, 35, 54, 104, 135, 209, 350, 405, 594, 740, 819, 989, 1274, 1595, 1710, 2079, 2345, 2484, 2925, 3239, 3740, 4464, 4850, 5049, 5459, 5670, 6104, 7749, 8255, 9044, 9315, 10730, 11025, 11934, 12879, 13529, 14534, 15575, 15930, 17765, 18144, 18914, 19305

Offset: 2

Author

Arkadiusz Wesolowski, Apr 16 2012

Keywords

• nonn

Comments

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.

Examples

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

Links

• Arkadiusz Wesolowski, Table of n, a(n) for n = 2..10000

Crossrefs

Cf. A000096, A014107, A192599.

Programs

Magma

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

Mathematica

Table[p = Prime[n + 1]; (p - 1)*Abs[p - 4]/2, {n, 45}]
Join[{1},((#-1)(#-4))/2&/@Prime[Range[3,50]]] (* Harvey P. Dale, Aug 04 2020 *)

PARI

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

Formula

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