A191147 The index of the smallest twin-prime pair average that equals the arithmetic mean of 2n-1 different pairs of a lower and an upper twin prime.
1, 3, 7, 17, 18, 31, 12, 22, 59, 67, 44, 38, 73, 79, 88, 83, 160, 71, 78, 81, 129, 70, 131, 210, 297, 89, 312, 189, 234, 254, 394, 143, 252, 220, 186, 304, 329, 299, 230, 360, 295, 466, 383, 193, 679, 218, 340, 561, 229, 427, 531, 575, 512, 547, 1328, 607
Offset: 1
Examples
a(4)= 17, because the 17th twin prime pair average, A014574(16)=240, can be written in 2*4-1=7 different ways as the mean of a lower and an upper twin prime.
Crossrefs
Cf. A190268.
Formula
a(n) = {min k: A190268(k) = 2*n-1}.
Comments