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A090959
Index of primorial(n) in A090958.
1
2, 4, 12, 41, 173, 679, 2806, 11221, 46200, 195762, 797388, 3338052, 13821332, 56256665, 230808795
OFFSET
1,1
COMMENTS
Significance: a(n+1)-1 is the count of numbers < primorial(n+1) whose largest prime divisor is <= prime(n). E.g., a(5) = 39 is the index of 210=2*3*5*7 in A090958, which means there are 38 numbers of the form 2^a*3^b*5^c < 210. Can someone derive a general formula (asymptotic)?
CROSSREFS
Cf. A090958.
Sequence in context: A218144 A222919 A264760 * A244035 A340025 A126942
KEYWORD
more,nonn
AUTHOR
Amarnath Murthy, Dec 31 2003
EXTENSIONS
Corrected and extended by David Wasserman, Feb 23 2006
STATUS
approved