A090154 - OEIS

A090154

Primes of the form identical digits preceded by a 6.

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

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OFFSET

1,1

LINKS

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

MATHEMATICA

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

CROSSREFS

Sequence in context: A062673 A284291 A045712 * A039390 A043213 A043993

Adjacent sequences: A090151 A090152 A090153 * A090155 A090156 A090157

KEYWORD

nonn,base

AUTHOR

Robert G. Wilson v, Nov 22 2003

STATUS

approved