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A071249
Numbers k such that gcd(k, R(k)) > 1, where R(k) (A004086) is the digit reversal of k.
4
2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 15, 18, 20, 21, 22, 24, 26, 27, 28, 30, 33, 36, 39, 40, 42, 44, 45, 46, 48, 50, 51, 54, 55, 57, 60, 62, 63, 64, 66, 68, 69, 70, 72, 75, 77, 78, 80, 81, 82, 84, 86, 87, 88, 90, 93, 96, 99, 101, 102, 105, 108, 110, 111, 114, 117, 120, 121
OFFSET
1,1
COMMENTS
Numbers k such that A055483(k) > 1. - Reinhard Zumkeller, Jun 18 2013
LINKS
MATHEMATICA
Select[ Range[125], GCD[ #, FromDigits[ Reverse[ IntegerDigits[ # ]]]] > 1 & ]
PROG
(Haskell)
a071249 n = a071249_list !! (n-1)
a071249_list = filter ((> 1) . a055483) [1..]
-- Reinhard Zumkeller, Jun 18 2013
CROSSREFS
Cf. A004086, A055483, A226778 (complement).
Sequence in context: A355620 A256476 A154771 * A084433 A084434 A034709
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, May 21 2002
EXTENSIONS
Edited by Robert G. Wilson v, Jun 07 2002
Definition corrected by N. J. A. Sloane, Aug 27 2020 following a suggestion from José Hernández Santiago
STATUS
approved