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A083976 Smallest palindromic prime containing exactly n 5's. 10
5, 15451, 15551, 1550551, 154555451, 155535551, 355555553, 35555155553, 75555555557, 1555550555551, 152555555555251, 10555555355555501, 15505555555550551, 35555555755555553, 1555555055505555551, 1555555551555555551, 115555555555555555511 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..500

MATHEMATICA

Table[d = 5; i = 1;

While[ x = IntegerDigits[Prime[i]];

  x != Reverse[x] || Count[x, d] != n , i++];

FromDigits[x], {n, 1, 6}]  (* Robert Price, Mar 25 2019 *)

CROSSREFS

Cf. A083972, A083973, A083974, A083976, A083977, A083978, A083979, A083980, A083981.

Sequence in context: A219011 A297482 A185686 * A013834 A263684 A191940

Adjacent sequences:  A083973 A083974 A083975 * A083977 A083978 A083979

KEYWORD

base,nonn

AUTHOR

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), May 21 2003

EXTENSIONS

More terms from Giovanni Resta, Feb 08 2006

STATUS

approved

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Last modified June 24 14:20 EDT 2021. Contains 345417 sequences. (Running on oeis4.)