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A178760 Number of tests performed to find the n-th term of the EKG sequence A064413. 2
0, 0, 2, 3, 1, 4, 6, 3, 3, 1, 5, 7, 4, 1, 7, 9, 3, 5, 5, 1, 13, 7, 9, 5, 11, 6, 5, 1, 11, 8, 6, 6, 1, 18, 9, 6, 1, 20, 9, 5, 7, 7, 1, 26, 7, 8, 8, 9, 10, 7, 14, 11, 8, 13, 16, 8, 1, 30, 11, 9, 1, 32, 12, 8, 9, 11, 1, 44, 10, 12, 10, 12, 13, 1, 49, 11, 12, 9, 13, 12, 1, 48, 12, 10, 14, 18, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

In the EKG sequence, to find the n-th term, we test each larger number not already in the sequence, looking for one that has a factor in common with previous term. The first two terms are zero because the first two terms of the EKG sequence are given. The odd primes appear in the EKG sequence where a(n) = 1. See A178761 for the cumulative number of tests.

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

CROSSREFS

Sequence in context: A265755 A330139 A046671 * A235715 A129566 A073809

Adjacent sequences:  A178757 A178758 A178759 * A178761 A178762 A178763

KEYWORD

nonn

AUTHOR

T. D. Noe, Jun 10 2010

STATUS

approved

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Last modified March 29 15:03 EDT 2020. Contains 333107 sequences. (Running on oeis4.)