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A064507 Numbers that yield primes when cast in their own base. 1
21, 27, 29, 61, 67, 111, 151, 191, 201, 203, 223, 241, 313, 319, 331, 351, 373, 397, 403, 409, 461, 463, 481, 553, 559, 571, 667, 711, 791, 807, 841, 869, 889, 931, 979, 1071, 1079, 1107, 1129, 1189, 1257, 1273, 1277, 1297, 1431, 1437, 1583, 1611, 1639 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

EXAMPLE

E.g. 21 in base 21 is 2*21+1=43, 111 is 1*111*111+1*111+1=12433, etc.

CROSSREFS

Cf. A064508.

Sequence in context: A035700 A134935 A173836 * A103246 A206347 A072392

Adjacent sequences:  A064504 A064505 A064506 * A064508 A064509 A064510

KEYWORD

nonn

AUTHOR

Jon Perry (perry(AT)globalnet.co.uk), Oct 06 2001

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.