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A090153 Primes of the form identical digits preceded by a 5. 2
5, 53, 59, 577, 599, 5333, 59999, 511111, 599999, 59999999, 577777777, 59999999999, 5111111111111, 53333333333333, 59999999999999, 577777777777777, 5111111111111111, 577777777777777777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..43

MATHEMATICA

Select[ FromDigits /@ Flatten[ Table[ PadRight[{5}, i, # ] & /@ {1, 2, 3, 4, 5, 6, 7, 8, 9}, {i, 2, 24}], 1], PrimeQ[ # ] &]

CROSSREFS

Sequence in context: A088712 A257667 A045711 * A188339 A103654 A079385

Adjacent sequences:  A090150 A090151 A090152 * A090154 A090155 A090156

KEYWORD

nonn,base

AUTHOR

Robert G. Wilson v, Nov 22 2003

STATUS

approved

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Last modified November 22 03:35 EST 2019. Contains 329386 sequences. (Running on oeis4.)