1,2

Numbers k for which A048673(2k-1) is of the form 3u+1.

Numbers k for which A292251(2k-1) is zero.

Antti Karttunen, Table of n, a(n) for n = 1..16369

Index entries for sequences computed from indices in prime factorization

(PARI)

A003961(n) = { my(f=factor(n)); for (i=1, #f~, f[i, 1] = nextprime(f[i, 1]+1)); factorback(f); }; \\ From A003961

A341346(n) = (((A003961(n+n-1)+1)/2)%3);

isA341349(n) = (1==A341346(n));

Positions of ones in A341346.

Cf. A003961, A048673, A254049, A292251, A341350 (complement).

Sequence in context: A324701 A047271 A047445 * A248638 A248881 A205534

Adjacent sequences: A341346 A341347 A341348 * A341350 A341351 A341352

nonn

Antti Karttunen, Feb 10 2021

approved