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a(n) = (prime(n)+1)*n - 1.
1

%I #8 Jun 12 2021 06:38:28

%S 2,7,17,31,59,83,125,159,215,299,351,455,545,615,719,863,1019,1115,

%T 1291,1439,1553,1759,1931,2159,2449,2651,2807,3023,3189,3419,3967,

%U 4223,4553,4759,5249,5471,5845,6231,6551,6959,7379,7643,8255,8535,8909,9199,9963

%N a(n) = (prime(n)+1)*n - 1.

%t Table[n(Prime[n]+1)-1,{n,50}] (* _Harvey P. Dale_, Apr 19 2018 *)

%K nonn

%O 1,1

%A _N. J. A. Sloane_, Jun 16 2003