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A049634 a(n) = T(n,n+2), array T as in A049627. 0

%I #8 Aug 06 2021 04:53:00

%S 2,6,9,15,19,29,35,47,55,71,79,101,111,131,145,169,183,217,231,261,

%T 279,313,331,373,393,431,455,501,521,579,603,653,685,729,757,817,847,

%U 907,941,1005,1033,1115,1147,1213,1255,1325,1363,1451,1487,1561,1605,1689

%N a(n) = T(n,n+2), array T as in A049627.

%o (PARI) T(n,k) = (n+1)*(k+1) - sum(i=0, n, sum(j=0, k, gcd(i,j)>1)); \\ A049627

%o a(n) = T(n, n+2); \\ _Michel Marcus_, Aug 06 2021

%Y Cf. A049627.

%K nonn

%O 0,1

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Aug 05 2021

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)