A239686 - cp's OEIS frontend

A239686 Numbers n such that if n = a U b (where U denotes concatenation) then sigma(a) + sigma(b) = abs(sigma(n) - n), where sigma(n) is the sum of the anti-divisors of n.

n	a(n)
1	47
2	118
3	205
4	846
5	898
6	1219
7	4181
8	4236
9	4701
10	4929
11	6014
12	6516
13	13276
14	30445
15	59956
16	61916
17	63216
18	67314
19	72066
20	79554
21	90674
22	106316
23	128998
24	129179
25	136816
26	142486
27	143396
28	180448
29	229914
30	284894
31	357841
32	421318
33	483286
34	486721
35	487618
36	500218
37	642445

[47, 118, 205, 846, 898, 1219, 4181, 4236, 4701, 4929, 6014, 6516, 13276, 30445, 59956, 61916, 63216, 67314, 72066, 79554, 90674, 106316, 128998, 129179, 136816, 142486, 143396, 180448, 229914, 284894, 357841, 421318, 483286, 486721, 487618, 500218, 642445]

cp's OEIS Frontend

A239686 Numbers n such that if n = a U b (where U denotes concatenation) then sigma(a) + sigma(b) = abs(sigma(n) - n), where sigma(n) is the sum of the anti-divisors of n.

Table of values

List of values

cp's OEIS Frontend

A239686 Numbers n such that if n = a U b (where U denotes concatenation) then sigma*(a) + sigma*(b) = abs(sigma*(n) - n), where sigma*(n) is the sum of the anti-divisors of n.

Table of values

List of values

A239686 Numbers n such that if n = a U b (where U denotes concatenation) then sigma(a) + sigma(b) = abs(sigma(n) - n), where sigma(n) is the sum of the anti-divisors of n.