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A249017 Records in A055460 (number of primes dividing the squarefree part of n!). 3
0, 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 34, 36, 37, 38, 39, 41, 42, 43, 44, 46, 47, 49, 50, 51, 52, 53, 54, 55, 57, 58, 59, 60, 61, 63, 64, 65, 67, 68, 69, 70, 72, 74, 75, 76, 77, 78, 79, 80, 81, 82, 85, 86, 87, 88, 91, 93, 95, 98, 99, 100 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Max Alekseyev, Table of n, a(n) for n = 1..100000

PROG

(PARI) np=vector(10^6); b=-1; r=0; for(n=1, 10^6, f=factor(n); for(i=1, matsize(f)[1], if(f[i, 2]%2, r += (-1)^np[f[i, 1]]; np[f[i, 1]]=1-np[f[i, 1]]; )); if(r>b, b=r; print1(b, ", ")) )

CROSSREFS

Cf. A249016 (indices of records), A055204

Sequence in context: A316228 A283970 A121166 * A214879 A187226 A026470

Adjacent sequences:  A249014 A249015 A249016 * A249018 A249019 A249020

KEYWORD

nonn

AUTHOR

Max Alekseyev, Oct 19 2014

STATUS

approved

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Last modified September 21 22:00 EDT 2019. Contains 327283 sequences. (Running on oeis4.)