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

1,1

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)

Prog

(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, ", ")));

Crossrefs

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

Positions of zeros in A324716.

Sequence in context: A368696 A369661 A340482 * A295230 A273202 A338909

Adjacent sequences: A324719 A324720 A324721 * A324723 A324724 A324725

Keyword

nonn

Author

Antti Karttunen, Mar 15 2019

Status

approved