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Odd nonludic numbers.
3

%I #9 Jan 30 2016 03:10:46

%S 9,15,19,21,27,31,33,35,39,45,49,51,55,57,59,63,65,69,73,75,79,81,85,

%T 87,93,95,99,101,103,105,109,111,113,117,123,125,129,133,135,137,139,

%U 141,145,147,151,153,155,159,163,165,167,169,171,177,183,185,187,189,191,195,197,199,201,203,205,207,213,215

%N Odd nonludic numbers.

%H Antti Karttunen, <a href="/A266419/b266419.txt">Table of n, a(n) for n = 1..10220</a>

%F Other identities. For all n >= 1:

%F a(n) = 1 + 2*A266410(n).

%o (Scheme, with _Antti Karttunen_'s IntSeq-library)

%o (define A266419 (MATCHING-POS 1 1 (lambda (n) (and (odd? n) (zero? (A192490 n))))))

%Y Intersection of A005408 and A192607.

%Y Cf. A192490, A266410, A237126.

%Y Cf. also A071904, A266420.

%K nonn

%O 1,1

%A _Antti Karttunen_, Jan 28 2016