A035497 - cp's OEIS frontend

A035497 Happy primes: primes that eventually reach 1 under iteration of "x -> sum of squares of digits of x".

n	a(n)
1	7
2	13
3	19
4	23
5	31
6	79
7	97
8	103
9	109
10	139
11	167
12	193
13	239
14	263
15	293
16	313
17	331
18	367
19	379
20	383
21	397
22	409
23	487
24	563
25	617
26	653
27	673
28	683
29	709
30	739
31	761
32	863
33	881
34	907
35	937
36	1009
37	1033
38	1039
39	1093
40	1151
41	1277
42	1303
43	1373
44	1427
45	1447
46	1481
47	1487
48	1511
49	1607
50	1663

[7, 13, 19, 23, 31, 79, 97, 103, 109, 139, 167, 193, 239, 263, 293, 313, 331, 367, 379, 383, 397, 409, 487, 563, 617, 653, 673, 683, 709, 739, 761, 863, 881, 907, 937, 1009, 1033, 1039, 1093, 1151, 1277, 1303, 1373, 1427, 1447, 1481, 1487, 1511, 1607, 1663]

cp's OEIS Frontend

A035497 Happy primes: primes that eventually reach 1 under iteration of "x -> sum of squares of digits of x".

Table of values

List of values