A129286 a(n) = A129152(n) / 5^5, where A129152 is the trajectory of 5^6 under A003415, the arithmetic derivative.

5, 6, 11, 12, 28, 60, 152, 388, 780, 2036, 4076, 8156, 16316, 32636, 66232, 169612, 339228, 1244808, 4856004, 14568120, 56648484, 190791072, 866874960, 4084880112, 16342519392, 73816544592, 305811402048, 1732931293824, 10145637246528, 52715820454848

Offset

0,1

Links

Table of n, a(n) for n=0..29.

Formula

a(n+1) = A129283(a(n)), a(0) = 5.

a(n) = A090635(n+3) / 4, i.e., the trajectory of 20 under A003415, divided by the common factor 4. - M. F. Hasler, Nov 27 2019

Prog

(Haskell)
a129286 n = a129286_list !! n
a129286_list = iterate a129283 5  -- Reinhard Zumkeller, Nov 01 2013

Crossrefs

Cf. A129284, A129285, A051674.

Sequence in context: A277095 A332482 A190895 * A334813 A083450 A136974

Adjacent sequences: A129283 A129284 A129285 * A129287 A129288 A129289

Keyword

nonn

Author

Reinhard Zumkeller, Apr 07 2007

Status

approved