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A221792 Number of n-digit cuban primes. 3
1, 3, 7, 17, 36, 109, 265, 762, 2125, 5964, 17205, 49989, 145047, 424155, 1250298, 3697457, 10985390, 32768938, 98054446, 294239322, 885300000, 2669959359, 8069333311, 24435519147 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..24.

FORMULA

a(n) = A113478(n) - A113478(n-1). - Jens Kruse Andersen, Jul 14 2014

CROSSREFS

Cf. A002407, A113478, A221793.

Sequence in context: A326520 A295146 A014314 * A089099 A089116 A244629

Adjacent sequences:  A221789 A221790 A221791 * A221793 A221794 A221795

KEYWORD

nonn,base,more

AUTHOR

Vladimir Pletser, Jan 25 2013

EXTENSIONS

a(19)-a(24) added from A113478 by Andrew Howroyd, Jan 14 2020

STATUS

approved

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Last modified September 21 21:32 EDT 2021. Contains 347605 sequences. (Running on oeis4.)