A090154 Primes of the form identical digits preceded by a 6.

61, 67, 677, 67777, 611111, 61111111, 67777777777, 67777777777777, 61111111111111111111111111, 67777777777777777777777777, 61111111111111111111111111111111

Offset: 1

Author

Robert G. Wilson v, Nov 22 2003

Keywords

• nonn
• base

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..23

Programs

Mathematica

Select[ FromDigits /@ Flatten[ Table[ PadRight[{6}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 100}], 1], PrimeQ[ # ] &]