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Numbers of form 41+n^2+n or 41+2*n^2.
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%I #6 Aug 03 2017 18:32:32

%S 41,43,47,49,53,59,61,71,73,83,91,97,113,131,139,151,169,173,197,203,

%T 223,241,251,281,283,313,329,347,379,383,421,433,461,491,503,547,553,

%U 593,619,641,689,691,743,763,797,841,853,911,923,971,1009,1033,1097

%N Numbers of form 41+n^2+n or 41+2*n^2.

%e 41 + 18 =59 and 41 + 20 =61

%t With[{nn=60},Take[Flatten[Table[{41+n^2+n , 41+2n^2},{n,0,nn}]]//Union,nn]] (* _Harvey P. Dale_, Aug 03 2017 *)

%Y Cf. A052293, A054056.

%K nonn,easy

%O 1,1

%A Stuart M. Ellerstein (ellerstein(AT)aol.com), Apr 28 2000

%E More terms from _James A. Sellers_, Apr 30 2000