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A071809 Smallest s such that sk-1 is squarefree for 1 <= k <= n. 0
2, 2, 2, 2, 4, 4, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 12, 12, 24, 120, 120, 120, 120, 120, 150, 150, 150, 150, 240, 240, 240, 240, 240, 240, 300, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840, 840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..62.

PROG

(PARI) for(n=1, 57, s=1; while(sum(i=1, n, issquarefree(s*i-1))<n, s++); print1(s, ", "))

CROSSREFS

Sequence in context: A032576 A276420 A239494 * A324762 A104976 A325710

Adjacent sequences:  A071806 A071807 A071808 * A071810 A071811 A071812

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Jun 06 2002

STATUS

approved

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Last modified November 13 20:57 EST 2019. Contains 329106 sequences. (Running on oeis4.)