A269309 - cp's OEIS frontend

A269309 Consider the Euler totient function of a number x. Take the sum of its digits. Repeat the process deleting the first addendum and adding the previous sum. The sequence lists the numbers that after some iterations reach x.

n	a(n)
1	13
2	21
3	63
4	177
5	206
6	412
7	655
8	824
9	1990
10	2637
11	11438
12	12485
13	23846
14	34132
15	40528
16	56202
17	87539
18	94597
19	1288999
20	3075239
21	3106991
22	20689503
23	31173397
24	46230492
25	65889985
26	79476719
27	170859904
28	266368503
29	295845211
30	420471958
31	445169688
32	797687940
33	962257660

[13, 21, 63, 177, 206, 412, 655, 824, 1990, 2637, 11438, 12485, 23846, 34132, 40528, 56202, 87539, 94597, 1288999, 3075239, 3106991, 20689503, 31173397, 46230492, 65889985, 79476719, 170859904, 266368503, 295845211, 420471958, 445169688, 797687940, 962257660]

cp's OEIS Frontend

A269309 Consider the Euler totient function of a number x. Take the sum of its digits. Repeat the process deleting the first addendum and adding the previous sum. The sequence lists the numbers that after some iterations reach x.

Table of values

List of values