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URL: https://oeis.org/A227858

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A227858
Numbers which start and end with the same digit in decimal.
7
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
Differs from A110751 which contains for example 1089. - R. J. Mathar, Jun 29 2025
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
KEYWORD
nonn,easy,base
AUTHOR
Brian E. Foose and Todd R. Haldeman, Nov 01 2013
STATUS
approved