A257103 - cp's OEIS frontend

A257103 Composite numbers n such that n'=(n+4)', where n' is the arithmetic derivative of n.

n	a(n)
1	21
2	56
3	1862
4	2526
5	1352797
6	2201422
7	3206062
8	34844422
9	42400318
10	8586830293
11	20967471193
12	23194695022
13	43790421673
14	45041812729
15	48438881254
16	101060544853
17	177839630854
18	180939891343
19	198419358598
20	305550990673
21	354694083622
22	661663823662
23	785220739279

[21, 56, 1862, 2526, 1352797, 2201422, 3206062, 34844422, 42400318, 8586830293, 20967471193, 23194695022, 43790421673, 45041812729, 48438881254, 101060544853, 177839630854, 180939891343, 198419358598, 305550990673, 354694083622, 661663823662, 785220739279]

cp's OEIS Frontend

A257103 Composite numbers n such that n'=(n+4)', where n' is the arithmetic derivative of n.

Table of values

List of values