A324722 Numbers k such that A324658(A156552(k)) is zero.

9, 21, 25, 35, 49, 55, 77, 95, 121, 125, 133, 143, 169, 185, 203, 209, 221, 265, 289, 299, 301, 319, 323, 343, 361, 371, 377, 413, 427, 437, 445, 451, 473, 481, 493, 497, 511, 527, 529, 531, 539, 553, 559, 583, 589, 605, 611, 623, 629, 667, 679, 689, 703, 707, 737, 763, 767, 779, 791, 793, 799, 805, 817, 841, 845, 847, 851, 869, 871, 899, 901

Offset: 1

Author

Antti Karttunen, Mar 15 2019

Keywords

• nonn

Comments

First even term is A005940(1+A324647(1)) = A005940(1+1116225) = 1912898. - Typo corrected by Antti Karttunen, Jul 21 2021

Links

• Antti Karttunen, Table of n, a(n) for n = 1..694 (based on Hans Havermann's factorization of A156552)
• Index entries for sequences related to binary expansion of n
• Index entries for sequences computed from indices in prime factorization
• Index entries for sequences related to sigma(n)

Crossrefs

Cf. A005940, A156552, A324647, A324652, A324658, A324723.

Positions of zeros in A324716.

Programs

PARI

isA324652(n) = ((2*n)==bitand(2*n, sigma(n)));
isA324722(n) = if(n>1,isA324652(A156552(n)));
k=0; n=0; while(k<105, n++; if(isA324722(n), k++; print1(n,", ")));