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A049634
a(n) = T(n,n+2), array T as in A049627.
0
2, 6, 9, 15, 19, 29, 35, 47, 55, 71, 79, 101, 111, 131, 145, 169, 183, 217, 231, 261, 279, 313, 331, 373, 393, 431, 455, 501, 521, 579, 603, 653, 685, 729, 757, 817, 847, 907, 941, 1005, 1033, 1115, 1147, 1213, 1255, 1325, 1363, 1451, 1487, 1561, 1605, 1689
OFFSET
0,1
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+2); \\ Michel Marcus, Aug 06 2021
CROSSREFS
Cf. A049627.
Sequence in context: A189760 A363373 A353083 * A120387 A325761 A176039
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Aug 05 2021
STATUS
approved