A080063 n mod (spf(n)+1), where spf(n) is the smallest prime dividing n (A020639).

1, 2, 3, 1, 5, 0, 7, 2, 1, 1, 11, 0, 13, 2, 3, 1, 17, 0, 19, 2, 1, 1, 23, 0, 1, 2, 3, 1, 29, 0, 31, 2, 1, 1, 5, 0, 37, 2, 3, 1, 41, 0, 43, 2, 1, 1, 47, 0, 1, 2, 3, 1, 53, 0, 1, 2, 1, 1, 59, 0, 61, 2, 3, 1, 5, 0, 67, 2, 1, 1, 71, 0, 73, 2, 3, 1, 5, 0, 79, 2, 1, 1, 83, 0, 1, 2, 3, 1, 89, 0, 3, 2, 1, 1, 5, 0

Offset

1,2

Comments

a(n) = 0 iff n mod 6 = 0 (A008588);

a(n) = 2 iff n mod 6 = 2 (A016933);

for n>1: a(n)=n iff n is prime (A000040, A008578).

Links

Table of n, a(n) for n=1..96.

Crossrefs

Cf. A080064, A080065, A010872, A010873, A010875, A010877, A010881.

Sequence in context: A300625 A264638 A201737 * A187680 A328731 A140706

Adjacent sequences: A080060 A080061 A080062 * A080064 A080065 A080066

Keyword

nonn

Author

Reinhard Zumkeller, Jan 24 2003

Status

approved