A187063 - cp's OEIS frontend

A187063 Numbers of the form (4^k - 1)/3 whose greatest prime divisor is of the form 2^q - 1 or 2^q + 1.

n	a(n)
1	5
2	21
3	85
4	341
5	5461
6	21845
7	22369621
8	89478485
9	1431655765
10	5726623061
11	91625968981
12	1501199875790165
13	1537228672809129301
14	98382635059784275285
15	1690200800304305868662270940501
16	1772303994379887830538409413707126101

[5, 21, 85, 341, 5461, 21845, 22369621, 89478485, 1431655765, 5726623061, 91625968981, 1501199875790165, 1537228672809129301, 98382635059784275285, 1690200800304305868662270940501, 1772303994379887830538409413707126101]

cp's OEIS Frontend

A187063 Numbers of the form (4^k - 1)/3 whose greatest prime divisor is of the form 2^q - 1 or 2^q + 1.

Table of values

List of values