A155544 Indices of primes having three or more identical digits.

187, 190, 193, 194, 240, 275, 280, 303, 318, 331, 345, 404, 430, 466, 468, 470, 471, 476, 481, 494, 521, 532, 566, 603, 604, 669, 706, 733, 859, 917, 935, 946, 962, 979, 981, 984, 995, 1020, 1107, 1117, 1140, 1224, 1227, 1230, 1231, 1242, 1245, 1246, 1251, 1253, 1268

Offset

1,1

Links

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

Example

946 is in the sequence because prime(946) = 7477 has three identical digits.

Mathematica

Select[Range[1300], Max[DigitCount[Prime[#]]]>2&] (* Harvey P. Dale, Mar 08 2013 *)

Crossrefs

Cf. A000040, A073069.

Sequence in context: A226675 A226672 A086000 * A221974 A227869 A081703

Adjacent sequences: A155541 A155542 A155543 * A155545 A155546 A155547

Keyword

nonn,base

Author

Juri-Stepan Gerasimov, Jan 24 2009

Extensions

Edited by N. J. A. Sloane, Jan 30 2009

Definition corrected, 859, 946, 962, 979 inserted by R. J. Mathar, May 15 2010

Status

approved