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

1,1

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

Links

Table of n, a(n) for n=1..22.

Formula

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

Crossrefs

Cf. A061712.

Sequence in context: A004771 A029724 A194400 * A243582 A336819 A056828

Adjacent sequences: A177765 A177766 A177767 * A177769 A177770 A177771

Keyword

nonn,more,base

Author

Vladimir Shevelev, May 13 2010

Extensions

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

Status

approved