A177768 Positions of decreases in sequence A061712 (related to Hamming weights of primes).

7, 15, 23, 31, 39, 63, 79, 95, 127, 175, 207, 255, 511, 543, 607, 767, 1023, 1279, 2047, 4095, 4423, 5135

Offset: 1

Author

Vladimir Shevelev, May 13 2010

Keywords

• nonn
• more
• base

Comments

Is the sequence infinite?

All terms listed are of the form == 7 (mod 8). Is there a reason for this phenomenon?

Conjecture: The numbers 2^k-1 for k > 2 are terms. - Chai Wah Wu, Sep 02 2021

Crossrefs

Cf. A061712.

Formula

{n : A061712(n) < A061712(n-1)}.

Extensions

a(20)-a(22) from Chai Wah Wu, Sep 06 2021