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A147554
Primes p such that p^2 divides p.p.p where dot "." means concatenation.
2
3, 13, 37, 9901, 333667, 99990001, 999999000001, 9999999900000001, 13168164561429877, 130654897808007778425046117
OFFSET
1,1
COMMENTS
Primes p dividing 10^(2*d)+10^d+1 where d=ceiling(log(p)/log(10)) is the number of decimal digits in p. - Max Alekseyev
There is no prime p such that p^2 divides p.p.
All primes of the forms 10^(2m) - 10^m + 1 or (1/3)*(10^(2m) + 10^m + 1) are in the sequence.
Primes in A243162. - Hans Havermann, May 31 2014
a(11) > 10^158. - Max Alekseyev, Sep 11 2024
CROSSREFS
Sequence in context: A120479 A146227 A019007 * A076800 A277411 A054975
KEYWORD
nonn,base,more
AUTHOR
Farideh Firoozbakht, Dec 26 2008
STATUS
approved