A381851 - cp's OEIS frontend

A381851 a(n) is the least number k such that both k and k - s have n prime divisors, counted with multiplicity, where s is the sum of the decimal digits of k.

n	a(n)
2	10
3	20
4	40
5	80
6	224
7	448
8	2176
9	24640
10	98816
11	287744
12	3771392
13	5637632
14	6508544
15	323903488
16	1126252544
17	7698939904
18	20511260672
19	249460531200
20	857557762048
21	582799458304
22	11797582053376
23	24614476447744
24	591901367468032
25	1314105503776768
26	5988418763882496

[10, 20, 40, 80, 224, 448, 2176, 24640, 98816, 287744, 3771392, 5637632, 6508544, 323903488, 1126252544, 7698939904, 20511260672, 249460531200, 857557762048, 582799458304, 11797582053376, 24614476447744, 591901367468032, 1314105503776768, 5988418763882496]

cp's OEIS Frontend

A381851 a(n) is the least number k such that both k and k - s have n prime divisors, counted with multiplicity, where s is the sum of the decimal digits of k.

Table of values

List of values