1,1

Because 33th digit in the decimal expansion of Pi, pi(33) = 0, all a(n>32) = 0. In A073055, a(1) = 1 and after a = 32400 terms are not correct. Partial sums of digits of decimal expansion of Pi are in A046974.

a(n) = pi(1)*...*pi(n); pi(n)=A000796(n).

a(3)=12 because pi(1)=3, pi(1)=1, pi(3)=4 and a(3)=3*1*4=12.

ppi={3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, 9, 3, 2, 3, 8, 4, 6, 2, 6, 4, 3, 3, 8, 3, 2, 7, 9, 5, 0, 2, 8}; Table[Product[ppi[[i]], {i, n}], {n, 1, 33}]

Cf. A000796, A046974, A073055.

Sequence in context: A032308 A117856 A073055 this_sequence A075780 A078666 A006804

Adjacent sequences: A074847 A074848 A074849 this_sequence A074851 A074852 A074853

nonn,base

Zak Seidov (zakseidov(AT)yahoo.com), Sep 10 2002