A080168 Primes beginning and ending with '11' in binary representation.

3, 7, 31, 59, 103, 107, 127, 199, 211, 223, 227, 239, 251, 419, 431, 439, 443, 463, 467, 479, 487, 491, 499, 503, 787, 811, 823, 827, 839, 859, 863, 883, 887, 907, 911, 919, 947, 967, 971, 983, 991, 1019, 1543, 1559, 1567, 1571, 1579, 1583, 1607, 1619, 1627

Offset

1,1

Comments

Intersection of A002145 and A080166.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

A000040(17)=59 -> '111011' therefore 59 is a term.

Mathematica

Select[Prime[Range[300]], Take[IntegerDigits[#, 2], 2]==Take[ IntegerDigits[ #, 2], -2]=={1, 1}&] (* Harvey P. Dale, Jul 28 2021 *)

Crossrefs

Cf. A004676, A074832, A030101.

Sequence in context: A145479 A077315 A365423 * A183075 A292890 A042131

Adjacent sequences: A080165 A080166 A080167 * A080169 A080170 A080171

Keyword

nonn,base

Author

Reinhard Zumkeller, Feb 04 2003

Status

approved