A190274 - cp's OEIS frontend

A190274 Numbers n such that n' = p^2-1, with n = semiprime = pq, n' is the arithmetic derivative of n. Also: semiprimes of the form p(p^2-p-1).

n	a(n)
1	15
2	95
3	287
4	1199
5	4607
6	23519
7	28799
8	101567
9	223199
10	296207
11	352799
12	903167
13	1019999
14	2032127
15	2230799
16	2666159
17	3285599
18	5896799
19	7606367
20	13939199
21	19392479
22	28839887
23	36154799
24	46139039
25	54295919
26	62412767
27	68250239
28	73384079
29	74440799
30	90316799
31	95234687
32	109672319
33	115263647
34	118129199
35	214562399
36	223279487
37	234503807
38	236792879
39	262963199
40	270420767
41	309829727
42	355897439
43	422999999
44	486823247
45	589884959
46	628687487

[15, 95, 287, 1199, 4607, 23519, 28799, 101567, 223199, 296207, 352799, 903167, 1019999, 2032127, 2230799, 2666159, 3285599, 5896799, 7606367, 13939199, 19392479, 28839887, 36154799, 46139039, 54295919, 62412767, 68250239, 73384079, 74440799, 90316799, 95234687, 109672319, 115263647, 118129199, 214562399, 223279487, 234503807, 236792879, 262963199, 270420767, 309829727, 355897439, 422999999, 486823247, 589884959, 628687487]

cp's OEIS Frontend

A190274 Numbers n such that n' = p^2-1, with n = semiprime = pq, n' is the arithmetic derivative of n. Also: semiprimes of the form p(p^2-p-1).

Table of values

List of values

cp's OEIS Frontend

A190274 Numbers n such that n' = p^2-1, with n = semiprime = p*q, n' is the arithmetic derivative of n. Also: semiprimes of the form p*(p^2-p-1).

Table of values

List of values

A190274 Numbers n such that n' = p^2-1, with n = semiprime = pq, n' is the arithmetic derivative of n. Also: semiprimes of the form p(p^2-p-1).