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A032693 Only 3 digits from (1,2,3,4,5,6,7,8,9) can precede a(n) to form a prime. +0
1
13, 21, 23, 29, 33, 37, 43, 49, 51, 59, 61, 69, 71, 79, 81, 93, 99, 101, 103, 111, 113, 121, 127, 133, 137, 161, 163, 167, 171, 179, 181, 211, 213, 219, 253, 257, 259, 269, 271, 277, 281, 287, 293, 301, 307, 309, 319, 329, 333, 337, 343, 347, 349, 351, 361 (list; graph; listen)
OFFSET

0,1

EXAMPLE

If a(n) = 333 then we find '2'333, '5'333 and '7'333 to be primes.

CROSSREFS

Sequence in context: A132946 A066515 A166656 this_sequence A034294 A049745 A087683

Adjacent sequences: A032690 A032691 A032692 this_sequence A032694 A032695 A032696

KEYWORD

nonn,base

AUTHOR

Patrick De Geest (pdg(AT)worldofnumbers.com), May 15, 1998.

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Last modified December 7 23:50 EST 2009. Contains 170430 sequences.


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