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 A222728 Palindromic composite numbers starting with a digit 7. 3
 77, 707, 717, 737, 747, 767, 777, 7007, 7117, 7227, 7337, 7447, 7557, 7667, 7777, 7887, 7997, 70007, 70107, 70307, 70407, 70707, 70807, 70907, 71017, 71117, 71217, 71417, 71517, 71617, 71717, 71817, 72027, 72127, 72327, 72427, 72527, 72627, 72827, 72927, 73137 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Subsequence of A032350 (palindromic nonprime numbers) and A002113 (palindromic numbers). Complement of A222727 (palindromic primes starting with a digit 7) with respect to A043042 (palindromic numbers starting with a digit 7). LINKS Jaroslav Krizek, Table of n, a(n) for n = 1..1038 MATHEMATICA Table[Select[Range[7*10^d, 8*10^d-1], CompositeQ[#]&&PalindromeQ[#]&], {d, 4}]//Flatten (* Harvey P. Dale, Nov 07 2021 *) CROSSREFS Cf. A032350, A002113, A222727, A043042. Sequence in context: A027574 A059047 A046149 * A223649 A205434 A125581 Adjacent sequences:  A222725 A222726 A222727 * A222729 A222730 A222731 KEYWORD nonn,base AUTHOR Jaroslav Krizek, Mar 09 2013 STATUS approved

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Last modified January 21 01:45 EST 2022. Contains 350473 sequences. (Running on oeis4.)