A032709 Numbers k such that k prefixed by '9' and followed by '1' is prime.

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

Offset

1,2

Links

Table of n, a(n) for n=1..60.

Crossrefs

Cf. A032702-A032733.

Sequence in context: A210497 A010383 A010403 * A243172 A370523 A024797

Adjacent sequences: A032706 A032707 A032708 * A032710 A032711 A032712

Keyword

nonn,base

Author

Patrick De Geest, May 15 1998

Extensions

Offset changed by Andrew Howroyd, Aug 13 2024

Status

approved