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A085608
Index of the smallest prime starting with n.
1
5, 1, 2, 13, 3, 18, 4, 23, 25, 26, 5, 31, 6, 35, 36, 38, 7, 42, 8, 304, 47, 48, 9, 53, 54, 56, 58, 60, 10, 63, 11, 453, 67, 69, 71, 73, 12, 76, 78, 79, 13, 82, 14, 86, 88, 89, 15, 93, 94, 96, 682, 98, 16, 100, 102, 103, 105, 107, 17, 110, 18, 807
OFFSET
1,1
FORMULA
a(n) = PrimePi(A018800(n)). - Michel Marcus, Oct 19 2013
EXAMPLE
a(4)=13 because prime[13]=41 is the smallest prime starting with 4.
CROSSREFS
Sequence in context: A328199 A289690 A088781 * A258339 A197080 A317823
KEYWORD
easy,base,nonn
AUTHOR
Zak Seidov, Jul 07 2003
STATUS
approved