A049635 a(n) = T(n,n+3), array T as in A049627.

2, 7, 11, 16, 23, 32, 39, 50, 63, 74, 89, 106, 117, 138, 159, 174, 199, 224, 241, 270, 299, 320, 349, 384, 409, 442, 481, 508, 549, 594, 621, 668, 707, 740, 791, 834, 869, 922, 979, 1016, 1073, 1134, 1169, 1234, 1299, 1340, 1403, 1470, 1517, 1584, 1655, 1706

Offset

0,1

Links

Table of n, a(n) for n=0..51.

Prog

(PARI) T(n, k) = (n+1)*(k+1) - sum(i=0, n, sum(j=0, k, gcd(i, j)>1)); \\ A049627
a(n) = T(n, n+3); \\ Michel Marcus, Aug 06 2021

Crossrefs

Cf. A049627.

Sequence in context: A287726 A190518 A190750 * A079140 A357843 A176897

Adjacent sequences: A049632 A049633 A049634 * A049636 A049637 A049638

Keyword

nonn

Author

Clark Kimberling

Extensions

More terms from Sean A. Irvine, Aug 05 2021

Status

approved