A136287 - cp's OEIS frontend

A136287 Numbers k such that k(k+1) - 1 and k(k+3) - 1 are both the initial member of a pair of twin primes and Sophie Germain primes. In other words, k(k+1) - 1, k(k+1) + 1, k(k+3) - 1, k(k+3) + 1, 2k(k+1) - 1, 2k(k+3) - 1 are all primes.

n	a(n)
1	3727470
2	16547895
3	20983605
4	25649085
5	27563745
6	27906165
7	38221260
8	41232960
9	55136850
10	70584030
11	72097305
12	78362415
13	91531320
14	94746750
15	121155165
16	134647800
17	134660370
18	141473715
19	150940515
20	188741475
21	261431820
22	275356290
23	275952675
24	276220965
25	307341165
26	311631255

[3727470, 16547895, 20983605, 25649085, 27563745, 27906165, 38221260, 41232960, 55136850, 70584030, 72097305, 78362415, 91531320, 94746750, 121155165, 134647800, 134660370, 141473715, 150940515, 188741475, 261431820, 275356290, 275952675, 276220965, 307341165, 311631255]

cp's OEIS Frontend

A136287 Numbers k such that k(k+1) - 1 and k(k+3) - 1 are both the initial member of a pair of twin primes and Sophie Germain primes. In other words, k(k+1) - 1, k(k+1) + 1, k(k+3) - 1, k(k+3) + 1, 2k(k+1) - 1, 2k(k+3) - 1 are all primes.

Table of values

List of values

cp's OEIS Frontend

A136287 Numbers k such that k*(k+1) - 1 and k*(k+3) - 1 are both the initial member of a pair of twin primes and Sophie Germain primes. In other words, k*(k+1) - 1, k*(k+1) + 1, k*(k+3) - 1, k*(k+3) + 1, 2*k*(k+1) - 1, 2*k*(k+3) - 1 are all primes.

Table of values

List of values

A136287 Numbers k such that k(k+1) - 1 and k(k+3) - 1 are both the initial member of a pair of twin primes and Sophie Germain primes. In other words, k(k+1) - 1, k(k+1) + 1, k(k+3) - 1, k(k+3) + 1, 2k(k+1) - 1, 2k(k+3) - 1 are all primes.