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A276199
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Smallest prime that begins with at least n digits of Pi.
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1
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3, 31, 31469, 314107, 314159, 314159, 314159207, 3141592603, 31415926541, 314159265307, 314159265359, 3141592653581, 314159265358909, 3141592653589711, 31415926535897921, 314159265358979347, 3141592653589793239, 3141592653589793239, 314159265358979323861
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history;
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internal format)
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OFFSET
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1,1
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LINKS
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EXAMPLE
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a(7) = 314159207, begins with first 7 digits of Pi = 3.141592653...
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PROG
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(Perl) use ntheory ":all"; sub a276199 { my $l=shift; my $p="3".substr(Pi($l+20), 2, $l-1); for my $dig (0 .. 20) { my $add = "0" x $dig; do { return "$p$add" if is_prime("$p$add"); } while length(++$add) == $dig; } } # Dana Jacobsen, Aug 30 2016
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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