Numbers k such that k-1, k+1, 2k-1, 2k+1, 3k-1, 3k+1, 4k-1 and 4k+1 are all primes.
A118860
Numbers k such that k-1, k+1, 2k-1, 2k+1, 3k-1, 3k+1, 4k-1 and 4k+1 are all primes.
Terms
- a(0) =21968100a(1) =37674210a(2) =81875220a(3) =356467230a(4) =416172330a(5) =750662640a(6) =1007393730a(7) =1150070040a(8) =1586271960a(9) =1963954650a(10) =3127171320a(11) =3669568560a(12) =4377895410a(13) =4383541050a(14) =5575083360a(15) =5686935870a(16) =5708418870a(17) =7365234450a(18) =7478474430a(19) =7681046100a(20) =8453862690a(21) =8898688680
External references
- oeis: A118860