A341349 Numbers k for which A254049(k) is not a multiple of 3.

1, 3, 5, 6, 9, 11, 13, 15, 16, 20, 21, 23, 25, 28, 29, 30, 31, 35, 36, 37, 41, 43, 45, 46, 50, 51, 53, 54, 56, 57, 61, 63, 65, 67, 69, 71, 73, 75, 76, 77, 78, 79, 80, 81, 85, 90, 94, 95, 96, 98, 99, 100, 101, 103, 106, 113, 114, 116, 119, 120, 123, 124, 125, 130, 131, 135, 136, 138, 140, 141, 143, 145, 146, 147

Offset

1,2

Comments

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

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

Links

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

Index entries for sequences computed from indices in prime factorization

Prog

(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));

Crossrefs

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

Keyword

nonn

Author

Antti Karttunen, Feb 10 2021

Status

approved