A071623 Least k such that n = A071532(k).

1, 4, 5, 6, 7, 8, 15, 18, 21, 22, 35, 64, 65, 130, 131, 160, 161, 170, 175, 186, 187, 190, 391, 392, 393, 508, 511, 514, 515, 516, 519, 530, 535, 536, 539, 540, 543, 552, 553, 566, 577, 584, 587, 588, 593, 594, 627, 630, 631, 636

Offset: 1

Author

Benoit Cloitre, Jun 22 2002

Keywords

• easy
• nonn

Comments

For some n, a(n+1)-a(n)=1.

Crossrefs

Cf. A071532.

Programs

PARI

for(n=1,50,s=1; while(abs(n+sum(i=1,s,sign((-1)^floor((3/2)^i))))>0,s++); print1(s,","))