

A158323


Greaters p2 of twin primes with equal number of odd digits of p1 and prime digits of p2.


0



5, 7, 31, 43, 73, 433, 463, 571, 643, 829, 883, 1231, 1723, 2089, 2131, 2143, 2311, 2593, 2659, 2689, 2713, 2791, 2971, 3259, 3331, 3373, 3463, 3529, 3583, 3673, 3853, 4003, 4051, 4483, 4651, 5443, 5503, 5653, 5743, 5851, 6451, 6553, 6571, 6703, 6763
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OFFSET

1,1


COMMENTS

The greater member of a twin prime pair such that the count of its digits is a prime number and equal to the count of odd digits in the smaller member. [From R. J. Mathar, May 19 2010]


LINKS

Table of n, a(n) for n=1..45.


EXAMPLE

If p1=29 and p2=31, then 1(9=odd)=1(3=prime) and 31=a(3). If p1=41 and p2=43, then 1(1=odd)=1(3=prime) and 43=a(4). If p1=71 and p2=73, then 2(7=odd and 1=odd)=2(7=prime and 3=prime) and 73=a(5).


CROSSREFS

Cf. A006512.
Sequence in context: A135324 A107639 A069688 * A025119 A025095 A025114
Adjacent sequences: A158320 A158321 A158322 * A158324 A158325 A158326


KEYWORD

nonn,base,less


AUTHOR

JuriStepan Gerasimov, Mar 16 2009


EXTENSIONS

Corrected (2131 inserted, 2533 replaced by 2593, 2659 inserted, 4231 removed etc.) by R. J. Mathar, May 19 2010


STATUS

approved



