A336060 Numbers p such that p, 2p-1, 3p-2, 4p-3, 5p-4, 6p-5, 7p-6, 8p-7 are primes.

512821, 22240681, 26486461, 99597961, 593009341, 1021157551, 1041298441, 1281196561, 1349985001, 1426148011, 1660907431, 1894757971, 2544774541, 3590232241, 3958824871, 4012463281, 4219580191, 4363137241, 6482599411, 7178651971, 8051820421, 8417194381

Offset

1,1

Comments

Each term is 1 modulo 210.

The subset p, 2p-1, 4p-3, 8p-7 is a Cunningham chain of the 2nd kind, cf. A057327.

Links

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..50

Wikipedia, Cunningham chain

Mathematica

Select[Prime[Range[387*10^6]], AllTrue[Table[n #-(n-1), {n, 2, 8}], PrimeQ]&] (* Harvey P. Dale, Mar 01 2023 *)

Crossrefs

Cf. A005382, A057327, A101769, A336059.

Sequence in context: A068816 A233858 A306952 * A329461 A257424 A257431

Adjacent sequences: A336057 A336058 A336059 * A336061 A336062 A336063

Keyword

nonn

Author

Jeppe Stig Nielsen, Jul 07 2020

Status

approved