1,3

Partial sums of minimal length pair-exchange / set-rotate sequence to reverse n distinct ordered elements. The subsequence of primes in this partial sum begins: 3, 7, 17.

Table of n, a(n) for n=1..11.

a(n) = Sum_{i=1..n} A048200(i).

a(5) = 0 + 1 + 2 + 4 + 10 = 17 is prime.

Cf. A048200.

Sequence in context: A048860 A233930 A292447 * A295089 A168582 A192958

Adjacent sequences: A176687 A176688 A176689 * A176691 A176692 A176693

more,nonn

Jonathan Vos Post, Apr 23 2010

a(10)-a(11) from Sai Satwik Kuppili and Bhadrachalam Chitturi, Apr 16 2019

approved