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A057858 Number of residue classes modulo n-th primorial number which contain only composite numbers. 2
0, 0, 2, 19, 158, 1825, 24264, 418343, 8040802, 186597501, 5447823140, 169904387719, 6317118448398, 260105476071197 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

FORMULA

a(n) = A002110(n) - A057857(n).

EXAMPLE

a(3) = 19 since 30 is the 3rd primorial number and 30k+m is always composite if m = 0, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27 or 28.

CROSSREFS

Cf. A002110, A057857.

Sequence in context: A037755 A037643 A198312 * A065898 A290188 A083196

Adjacent sequences:  A057855 A057856 A057857 * A057859 A057860 A057861

KEYWORD

nonn

AUTHOR

Henry Bottomley, Sep 08 2000

STATUS

approved

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Last modified June 2 11:35 EDT 2020. Contains 334771 sequences. (Running on oeis4.)