A109394 A000934(A000934(n)).

10, 12, 13, 13, 14, 15, 15, 15, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22

Offset

0,1

Links

Table of n, a(n) for n=0..60.

Formula

a(n) = floor( (7+sqrt(1+48*floor( (7+sqrt(1+48*n))/2 )))/2 ).

Example

a(0) = 10 because A000934(0) = 4 and A000934(4) = 10.
a(1) = 12 because A000934(1) = 7 and A000934(7) = 12.

Crossrefs

Cf. A000934.

Sequence in context: A187285 A098732 A301860 * A285687 A139704 A139819

Adjacent sequences: A109391 A109392 A109393 * A109395 A109396 A109397

Keyword

easy,nonn

Author

Jonathan Vos Post, Aug 26 2005

Status

approved