

A072812


Take the binary number P = 1.01101010001... which has an 1 in each decimal position that is a prime (e.g. 2,3,5,7...) and convert this number to base 10.


0



1, 4, 1, 4, 6, 8, 2, 5, 0, 9, 8, 5, 1, 1, 1, 1, 6, 6, 0, 2, 4, 8, 1, 0, 9, 6, 2, 2, 1, 5, 4, 3, 0, 7, 7, 0, 8, 3, 6, 5, 7, 7, 4, 2, 3, 8, 1, 3, 7, 9, 1, 6, 9, 7, 7, 8, 6, 8, 2, 4, 5, 4, 1, 4, 4, 8, 8, 6, 4, 0, 9, 6, 0, 6, 1, 9, 3, 5, 7, 3, 3, 4, 1, 9, 6, 2, 9, 0, 0, 4, 8, 4, 2, 8, 4, 7, 5, 7, 7, 7, 9, 3, 9, 6, 1, 6
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..106.


EXAMPLE

1.414682509851111660248109622154307708366...


MAPLE

a := 1; for i from 2 to 1000 do if isprime(i) then a := a+10^(i); end if; end do; b := evalf(a, 100); evalf(convert(b, decimal, binary), 40);


CROSSREFS

Essentially the same as A051006, which is the main entry.
Cf. A000040, A010051.
Sequence in context: A193750 A092856 A051006 * A244097 A162956 A131112
Adjacent sequences: A072809 A072810 A072811 * A072813 A072814 A072815


KEYWORD

base,cons,easy,nonn


AUTHOR

Andre Neumann Kauffman (andrekff(AT)hotmail.com), Aug 13 2002


EXTENSIONS

More digits from Alois P. Heinz, Jan 28 2017


STATUS

approved



