1,1

The sequence is highly non-monotonic. a(n) appears in the correlation coefficient between digits of p(n) and their indices.

Table of n, a(n) for n=1..75.

a(n) = Sum_i [i*(i-th digit)] for n-th prime

a(7)=15 because p[7]=17 and 1*1+2*7=15

Sequence in context: A130159 A127314 A294499 * A316189 A297346 A211517

Adjacent sequences: A092254 A092255 A092256 * A092258 A092259 A092260

easy,nonn,base

Zak Seidov, Feb 20 2004

approved