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A319017 Prime numbers which satisfy the regex m1{1,m1}m2{1,m2}m3{1,m3}m4{1,m4}m5{1,m5} where mi are one-digit Lucas numbers. 0
21347, 2213347, 2213447, 21334447, 21344447, 21344777, 22133477, 213334477, 221344477, 2134444777, 22133344447, 221344477777, 2133344447777, 2133347777777, 2213447777777, 22133344447777, 213344447777777, 221333447777777, 22133344447777777 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

mi=Lucas numbers sequence(i), i.e., m1=2, m2=1, m3=3 and so on.

LINKS

Table of n, a(n) for n=1..19.

EXAMPLE

The prime number 2213447 belongs to this sequence as 2, 1, 3, 4 and 7 are the one-digit Lucas numbers (ordered as in Lucas number sequence) and each digit k is repeated at most k times (including itself), in accordance with the regex described in the sequence name (2 repeated two times, 1 one time, 3 repeated one time, 4 repeated two times and 7 one time).

The prime number 22133344447777777 is the best example, as each one-digit Lucas number k is repeated exactly k times.

CROSSREFS

Cf. A000032.

Sequence in context: A253980 A250532 A234454 * A286635 A324259 A083361

Adjacent sequences:  A319014 A319015 A319016 * A319018 A319019 A319020

KEYWORD

nonn,base,fini,full

AUTHOR

Pierandrea Formusa, Sep 07 2018

STATUS

approved

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Last modified August 26 00:35 EDT 2019. Contains 326324 sequences. (Running on oeis4.)