A090862 - OEIS

A090862

Smallest b > 10 such that the decimal representation of the n-th prime is not a prime in base b representation.

11, 11, 11, 11, 11, 12, 11, 11, 11, 12, 11, 11, 11, 14, 13, 11, 11, 11, 11, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 11, 11, 12, 11, 11, 11, 11, 11, 11, 12, 12, 11, 11, 12, 11, 11, 11, 11, 11, 11, 12, 11, 11, 11, 12, 11, 11

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OFFSET

5,1

COMMENTS

a(A091922(n))=n and a(m)<>n for m < A091922(n).

LINKS

Table of n, a(n) for n=5..73.

EXAMPLE

n=10: A000040(10)=29 in base 11 is 2*11^1+9*11^0=31 isprime,

29 in base 12 is 2*12^1+9*12^0=33=3*11, therefore a(10)=12.

CROSSREFS

Cf. A091923, A091924.