A199974 a(n) = the sum of LCQ_C(n, k) for 1 <= k <= n (see definition in comments).

2, 6, 7, 14, 12, 25, 18, 28, 28, 33, 28, 64, 35, 47, 51, 59, 45, 76, 51, 81, 68, 74, 61, 128, 72, 88, 87, 103, 78, 145, 84, 119, 107, 114, 101, 195, 101, 129, 126, 166

Offset

1,1

Comments

Definition of LCQ_C: The least common non-divisor of type C (LCQ_C) of two positive integers a and b (a<=b) is the least positive non-divisor q of numbers a and b such that 1<=q common to a and b. LCQ_C(a, b) >= 2.

Links

Table of n, a(n) for n=1..40.

Example

 For n = 6, a(6) = 9 because LCQ_B(6, 1) = 4, LCQ_B(6, 2) = 4, LCQ_B(6, 3) = 4, LCQ_B(6, 4) = 5, LCQ_B(6, 5) = 4, LCQ_B(6, 6) = 4. Sum of results is 25.

Crossrefs

Cf.: A196443 (the sum of GCQ_A(n, k) for 1 <= k <= n).

Cf.: A199972 (the sum of GCQ_B(n, k) for 1 <= k <= n).

Cf.: A199971 (the sum of LCQ_A(n, k) for 1 <= k <= n).

Cf.: A199973 (the sum of LCQ_B(n, k) for 1 <= k <= n).

Sequence in context: A092310 A306924 A087376 * A176279 A265739 A281167

Adjacent sequences: A199971 A199972 A199973 * A199975 A199976 A199977

Keyword

nonn

Author

Jaroslav Krizek, Nov 26 2011

Status

approved