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A032709 n prefixed by '9' and followed by '1' is a prime. 0
1, 4, 7, 9, 15, 16, 18, 22, 24, 28, 31, 34, 37, 39, 42, 43, 46, 49, 51, 52, 55, 60, 63, 66, 72, 78, 79, 81, 85, 87, 90, 93, 94, 108, 112, 114, 115, 129, 133, 138, 141, 154, 157, 159, 162, 163, 169, 171, 177, 178, 180, 181, 184, 192, 195, 196, 204, 205, 211, 222 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..59.

CROSSREFS

Sequence in context: A210497 A010383 A010403 * A243172 A024797 A271253

Adjacent sequences:  A032706 A032707 A032708 * A032710 A032711 A032712

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, May 15 1998

STATUS

approved

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Last modified July 28 03:49 EDT 2021. Contains 346316 sequences. (Running on oeis4.)