A383177 - cp's OEIS frontend

A383177 Sphenic numbers k such that floor(log(k)/log(lpf(k))) = 1+floor(log(k)/log(p)) for all primes p | k such that p > lpf(k), where lpf = A020639(k).

n	a(n)
1	1001
2	1309
3	1547
4	1729
5	2093
6	2261
7	3553
8	4199
9	4301
10	4807
11	5681
12	6061
13	6479
14	7337
15	7843
16	8671
17	9269
18	9361
19	9889
20	10373
21	10879
22	11063
23	11339
24	11687
25	11803
26	11891
27	12121
28	12617
29	13079
30	13717
31	13949
32	13981
33	14911
34	15283
35	15457
36	16211
37	16523
38	17081
39	17329
40	17719

[1001, 1309, 1547, 1729, 2093, 2261, 3553, 4199, 4301, 4807, 5681, 6061, 6479, 7337, 7843, 8671, 9269, 9361, 9889, 10373, 10879, 11063, 11339, 11687, 11803, 11891, 12121, 12617, 13079, 13717, 13949, 13981, 14911, 15283, 15457, 16211, 16523, 17081, 17329, 17719]

cp's OEIS Frontend

A383177 Sphenic numbers k such that floor(log(k)/log(lpf(k))) = 1+floor(log(k)/log(p)) for all primes p | k such that p > lpf(k), where lpf = A020639(k).

Table of values

List of values