%I #15 Mar 24 2021 15:44:11
%S 3,10,17,23,30,37,44,51,58,64,71,78,85,92,99,105,112,119,126,133,139,
%T 146,153,160,167,174,180,187,194,201,208,215,221,228,235,242,249,256,
%U 262,269,276,283,290,297,303,310,317,324,331,338,344,351,358,365,372
%N a(n) = A001952(2*n+1).
%H N. J. A. Sloane, <a href="/A115004/a115004.txt">Families of Essentially Identical Sequences</a>, Mar 24 2021 (Includes this sequence)
%o (Python)
%o from sympy import integer_nthroot
%o def A342280(n): return 4*n+2+integer_nthroot(8*n*(n+1)+2,2)[0] # _Chai Wah Wu_, Mar 16 2021
%Y Bisection of A001952.
%Y Cf. A187393.
%K nonn
%O 0,1
%A _N. J. A. Sloane_, Mar 16 2021