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A336059
Numbers p such that p, 2p-1, 3p-2, 4p-3 are primes.
2
331, 1531, 3061, 4261, 4951, 6841, 10831, 15391, 18121, 23011, 25411, 26041, 31771, 33301, 40111, 41491, 45061, 49831, 53881, 59341, 65851, 70141, 73771, 78541, 88741, 95461, 96931, 109471, 111721, 112621, 117721, 131311, 133201, 134731, 135301, 150151, 165901
OFFSET
1,1
COMMENTS
The subset p, 2p-1, 4p-3 is a Cunningham chain of the 2nd kind, cf. A057326.
FORMULA
a(n) = A237189(n) + 1.
MATHEMATICA
Select[Range[10^5], AllTrue[{#, 2# - 1, 3# - 2, 4# - 3}, PrimeQ] &] (* Amiram Eldar, Jul 07 2020 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Jeppe Stig Nielsen, Jul 07 2020
STATUS
approved