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Search: id:A145532
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| A145532 |
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a(n)=number of numbers removed in each step of Eratosthenes' sieve for 5! |
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+0
20
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OFFSET
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1,1
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COMMENT
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Number of steps in Eratosthenes' sieve for n! is A133228(n).
Number of primes less than 5! is equal = 120-59-19-7-4-1 = 30 = A003604(5).
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EXAMPLE
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a(1)=59 because in first step we removed all numbers divisible by 2 (=60) with exception first one number 2.
a(2)=19 because number of numbers divisible by 3 and not divisible by 2 is 20 and we remove all with exception first one number 3.
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CROSSREFS
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A003604, A133228, A145532-A145540
Sequence in context: A051321 A088665 A159250 this_sequence A152214 A033379 A122252
Adjacent sequences: A145529 A145530 A145531 this_sequence A145533 A145534 A145535
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KEYWORD
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fini,nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Oct 12 2008
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