A227858 Numbers which start and end with the same digit in decimal.

1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 121, 131, 141, 151, 161, 171, 181, 191, 202, 212, 222, 232, 242, 252, 262, 272, 282, 292, 303, 313, 323, 333, 343, 353, 363, 373, 383, 393, 404, 414, 424, 434, 444, 454, 464, 474, 484, 494, 505, 515, 525, 535, 545, 555, 565, 575, 585, 595, 606, 616, 626

Offset

1,2

Comments

Supersequence of A002113 and A208259.

The first term that is not a palindromic number is a(109) = 1011. - Alonso del Arte, Nov 01 2013

Primes in this sequence are A077652. [Jonathan Vos Post, Nov 02 2013]

Links

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Formula

a(n) = 10n + O(1). - Charles R Greathouse IV, Nov 01 2013

Mathematica

Select[Range[700], IntegerDigits[#][[1]]==IntegerDigits[#][[-1]]&] (* Harvey P. Dale, Nov 28 2019 *)

Prog

(PARI) is(n)=n=digits(n); n[1]==n[#n] \\ Charles R Greathouse IV, Nov 01 2013

Crossrefs

Cf. A002113, A077652, A208259.

Sequence in context: A110751 A147882 A002113 * A335779 A240601 A324988

Adjacent sequences: A227855 A227856 A227857 * A227859 A227860 A227861

Keyword

nonn,easy,base

Author

Brian E. Foose and Todd R. Haldeman, Nov 01 2013

Status

approved