

A115095


Positions of 4 in A038800.


0



1, 2, 11, 20, 83, 149, 188, 209, 326, 347, 566, 944, 1301, 1565, 1574, 1607, 1805, 1892, 1943, 2102, 2228, 2531, 3173, 3485, 4379, 5135, 5534, 6299, 6722, 6950, 7223, 7727, 7970, 8105, 8273, 8882, 9785, 9914, 10112, 10985, 11654, 11930, 12221, 13547
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OFFSET

1,2


COMMENTS

Starting with a(2)=2, numbers m such that 10(m1)+{1,3,7,9} are all primes.
Essentially the same as A064975. [From R. J. Mathar, Aug 11 2008]


REFERENCES

4 is maximal possible number of primes between 10n and 10(n+1).


LINKS

Table of n, a(n) for n=1..44.


EXAMPLE

11 is OK because 10(111)+{1,3,7,9} = 101,103,107,109 all prime.


CROSSREFS

Cf. A038800 Number of primes between 10n and 10n+9.
Cf. A038800.
Sequence in context: A226416 A146087 A064975 * A061907 A052216 A094629
Adjacent sequences: A115092 A115093 A115094 * A115096 A115097 A115098


KEYWORD

nonn


AUTHOR

Zak Seidov, Mar 01 2006


STATUS

approved



