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A121402 Prime values of integers written in factorial base, interpreted as in base 10. 0
11, 101, 211, 311, 1021, 1201, 1301, 1321 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

FORMULA

a(n) = A007623(n)_10 if prime = (A007623 Integers written in factorial base) interpreted as if in base 10, iff prime.

EXAMPLE

a(1) = 11 = 1*(2!) + 1*(1!) = A007623(3)_10.

a(2) = 101 = 1*(3!) + 0*(2!) + 1*(1!) = A007623(7)_10.

a(3) = 211 = 2*(3!) + 1*(2!) + 1*(1!) = A007623(15)_10.

a(4) = 311 = 3*(3!) + 1*(2!) + 1*(1!) = A007623(21)_10.

a(5) = 1021 = 1*(4!) + 0*(3!) + 2*(2!) + 1*(1!) = A007623(29)_10.

a(6) = 1201 = 1*(4!) + 2*(3!) + 0*(2!) + 1*(1!) = A007623(37)_10.

a(7) = 1301 = 1*(4!) + 3*(3!) + 0*(2!) + 1*(1!) = A007623(43)_10.

a(8) = 1321 = 1*(4!) + 3*(3!) + 2*(2!) + 1*(1!) = A007623(47)_10.

CROSSREFS

Cf. A007623 Integers written in factorial base.

Sequence in context: A142317 A180406 A174884 * A156307 A057532 A193699

Adjacent sequences:  A121399 A121400 A121401 * A121403 A121404 A121405

KEYWORD

base,easy,nonn

AUTHOR

Jonathan Vos Post, Sep 06 2006

STATUS

approved

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Last modified December 4 15:00 EST 2020. Contains 338925 sequences. (Running on oeis4.)