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A065899 Which composite number is A036691[n], the n-th compositorial number, the product of first n composite number? 0
1, 14, 148, 1458, 15293, 188782, 2692726, 40909988, 660637057, 11976280879 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

a[2] = 14 because 4*6 = 24, the 2nd compositorial number is the 14th composite number: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24.

MATHEMATICA

Composite[n_] := FixedPoint[n + PrimePi[ # ] + 1 &, n + PrimePi[n] + 1]; Table[c = Product[ Composite[i], {i, 1, n} ]; c - PrimePi[c] - 1, {n, 1, 10} ]

CROSSREFS

Table[A036691[n]-(PrimePi[A036691[n]])-1, {n, 1, 9}]

Cf. A002808, A000720, A036691.

Sequence in context: A207259 A016170 A081201 * A162965 A067103 A081184

Adjacent sequences:  A065896 A065897 A065898 * A065900 A065901 A065902

KEYWORD

nonn

AUTHOR

Labos Elemer, Nov 28 2001

EXTENSIONS

One more term from Robert G. Wilson v, Nov 29 2001

STATUS

approved

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Last modified October 20 05:49 EDT 2019. Contains 328247 sequences. (Running on oeis4.)