A064980 n*10^6-1, n*10^6-3, n*10^6-7 and n*10^6-9 are all prime.

719, 11225, 16736, 19304, 29117, 43496, 64259, 75542, 88514, 99803, 119195, 131051, 153080, 153179, 154874, 155720, 162188, 163091, 163778, 175214, 200303, 204098, 221330, 257135, 258845, 268559, 276401, 322454, 357251, 358217, 385565

Offset

1,1

Links

Table of n, a(n) for n=1..31.

Mathematica

Select[ Range[5 10^5], PrimeQ[10^6# - 1] && PrimeQ[10^6# - 3] && PrimeQ[10^6# - 7] && PrimeQ[10^6# - 9] &]

Crossrefs

Sequence in context: A144767 A127227 A139177 * A290120 A101997 A139195

Adjacent sequences: A064977 A064978 A064979 * A064981 A064982 A064983

Keyword

easy,nonn

Author

Robert G. Wilson v, Oct 30 2001

Status

approved