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A229107 Palindromic prime time display in hours, minutes, seconds on a six-digit 24-hour digital clock. 2
2, 3, 5, 7, 11, 101, 131, 151, 313, 353, 727, 757, 919, 929, 10301, 10501, 10601, 11311, 11411, 12421, 12721, 12821, 13331, 13831, 13931, 14341, 14741, 15451, 15551, 30103, 30203, 30403, 30703, 30803, 31013, 31513, 32323, 32423, 33533, 34543, 34843, 35053 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Leading zeros are ignored, so the term a(7) = 131, for example, corresponds to the display 00:01:31. Sequence has 69 entries.

LINKS

Shyam Sunder Gupta, Table of n, a(n) for n = 1..69 (complete sequence)

EXAMPLE

151 is in the sequence because it is palindromic prime and displays the time as 00:01:51.

MATHEMATICA

palindromicQ[n_] := TrueQ[IntegerDigits[n] == Reverse[IntegerDigits[n]]]; Select[Select[Table[10000 hr + 100 mnt + sec, {hr, 0, 23}, {mnt, 0, 59}, {sec, 0, 59}] // Flatten, palindromicQ@# &], PrimeQ]

CROSSREFS

Cf. A222620, A050246.

Sequence in context: A082806 A157868 A222116 * A109574 A084837 A062352

Adjacent sequences:  A229104 A229105 A229106 * A229108 A229109 A229110

KEYWORD

nonn,fini,full,base

AUTHOR

Shyam Sunder Gupta, Sep 13 2013

STATUS

approved

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Last modified August 12 17:17 EDT 2020. Contains 336439 sequences. (Running on oeis4.)