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A086247 Differences of successive 7-smooth numbers. 2
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 2, 2, 1, 3, 1, 2, 1, 2, 2, 3, 1, 4, 2, 3, 3, 1, 1, 4, 2, 4, 3, 1, 6, 2, 3, 5, 1, 3, 6, 6, 2, 2, 5, 3, 4, 8, 5, 1, 2, 7, 5, 4, 3, 3, 10, 2, 6, 7, 5, 9, 3, 4, 4, 10, 6, 8, 1, 15, 3, 2, 5, 2, 4, 14, 10, 8, 6, 6, 15, 5, 4, 12, 7, 7, 10, 15, 3, 6, 8, 8, 5, 15, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

COMMENTS

a(n) = A002473(n+1) - A002473(n);

A002473(n) is a term of A085153 iff a(n)=1.

LINKS

Table of n, a(n) for n=1..96.

Eric Weisstein's World of Mathematics, Smooth Number

CROSSREFS

Cf. A061987.

Sequence in context: A194884 A078401 A271381 * A116452 A219966 A103958

Adjacent sequences:  A086244 A086245 A086246 * A086248 A086249 A086250

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jul 13 2003

STATUS

approved

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Last modified February 24 18:24 EST 2018. Contains 299628 sequences. (Running on oeis4.)