A066124 Numbers that in base 2 need three 'Reverse and Add' steps to reach a palindrome.

44, 50, 54, 58, 72, 92, 98, 118, 154, 156, 184, 194, 206, 214, 216, 234, 242, 272, 296, 316, 364, 376, 386, 406, 466, 470, 478, 502, 564, 566, 570, 572, 626, 628, 634, 688, 690, 696, 716, 732, 748, 752, 770, 790, 798, 806, 814, 820, 822, 824, 854, 870, 880

Offset: 1

Author

Klaus Brockhaus, Dec 08 2001

Keywords

• base
• nonn

Comments

The analog of A065208 in base 2. The number of steps starts at 0, so palindromes (cf. A006995) are excluded.

Numbers k such that A066057(k) = 3. - Andrew Howroyd, Dec 05 2024

Links

• Harry J. Smith, Table of n, a(n) for n=1,...,1000
• Index entries for sequences related to Reverse and Add!

Crossrefs

Cf. A006995, A065208, A066057, A066122.

Programs

PARI

isok(n,s=3)={for(k=0, s, my(r=fromdigits(Vecrev(binary(n)),2)); if(r==n, return(k==s)); n += r); 0} \\ Andrew Howroyd, Dec 05 2024

Extensions

Offset changed from 0 to 1 by Harry J. Smith, Feb 01 2010