A066125 Numbers that in base 2 need four 'Reverse and Add' steps to reach a palindrome.

19, 25, 71, 83, 101, 111, 113, 123, 271, 283, 295, 307, 319, 331, 333, 335, 355, 357, 359, 379, 395, 397, 409, 415, 419, 421, 431, 433, 439, 445, 457, 461, 463, 475, 481, 485, 487, 491, 499, 505, 571, 627, 825, 881, 911, 967, 1055, 1079, 1083, 1103, 1127

Offset: 1

Author

Klaus Brockhaus, Dec 08 2001

Keywords

• base
• nonn

Comments

The analog of A065209 in base 2. The number of steps starts at 0, so palindromes (cf. A006995) are excluded.

Numbers k such that A066057(k) = 4. - Andrew Howroyd, Dec 05 2024

Links

• Andrew Howroyd, Table of n, a(n) for n = 1..10000
• Index entries for sequences related to Reverse and Add!

Crossrefs

Cf. A006995, A065209, A066057, A066122.

Programs

PARI

select(k->isok(k,4), [1..1200]) \\ isok defined in A066122. - Andrew Howroyd, Dec 05 2024

Extensions

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