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A089981 Decimal primes whose decimal representation in base 3 is also prime. 1
2, 2111, 2221, 10211, 12011, 12211, 20201, 21011, 21101, 21211, 22111, 101021, 101111, 102101, 102121, 110221, 111121, 111211, 120011, 120121, 121001, 121021, 122011, 201101, 202001, 202021, 210011, 210101, 1000211, 1010201, 1012201 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..32.

EXAMPLE

67 is prime in decimal and 67 base 3 is 2111 which is also prime in decimal.

CROSSREFS

Sequence in context: A101722 A004908 A004813 * A028487 A073476 A051103

Adjacent sequences:  A089978 A089979 A089980 * A089982 A089983 A089984

KEYWORD

base,nonn

AUTHOR

Cino Hilliard (hillcino368(AT)gmail.com), Jan 18 2004

STATUS

approved

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Last modified June 18 17:08 EDT 2013. Contains 226355 sequences.