0,1

Table of n, a(n) for n=0..66.

a(0)=3 because 10*0+3=3 (prime),

a(1)=13 because 10*1+3=13 (prime),

a(3)=3 because 10*3+3=33 (composite)=>3 (prime),

a(78)=83 because 10*78+3=783 (composite) =>83 (prime).

Sequence in context: A057589 A299645 A180970 * A166566 A011533 A277965

Adjacent sequences: A135577 A135578 A135579 * A135581 A135582 A135583

nonn,base

Zak Seidov, Feb 24 2008

approved