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A181557 Indices k for which A031883(k) = 2 = A000959(k+1)-A000959(k), i.e., indices of (lesser) "twin" lucky numbers. 1

%I

%S 1,3,5,9,13,16,18,27,29,35,38,46,49,53,59,69,75,80,83,87,90,95,100,

%T 102,106,117,120,136,138,141,143,149,151,154,156,159,164,167,178,182,

%U 185,187,201,205,211,215,217,221,227,229,232,246,248,256,265,271,283,286

%N Indices k for which A031883(k) = 2 = A000959(k+1)-A000959(k), i.e., indices of (lesser) "twin" lucky numbers.

%H Amiram Eldar, <a href="/A181557/b181557.txt">Table of n, a(n) for n = 1..10000</a>

%Y Cf. A000959, A031883.

%K nonn

%O 1,2

%A _M. F. Hasler_, Oct 31 2010

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Last modified September 29 16:13 EDT 2020. Contains 337432 sequences. (Running on oeis4.)