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A081941 a(1) = 1; for n>1, a(n)= smallest number greater than the previous term such that a(n-1)*a(n) + 1 is a palindrome. 1
1, 2, 3, 7, 14, 23, 32, 45, 153, 167, 352, 3610, 4977, 11332, 27866, 46955, 275824, 508960, 1978100, 5211763, 22579170, 50936903, 98746668, 103408400, 105030502, 106085805, 115059404, 458335581, 2483842510, 4847757902, 6623606611 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
3 is followed by 7 because 3*4+1, 3*5+1 and 3*6+1 aren't palindromes, but 3*7+1 = 22 is.
CROSSREFS
Cf. A082270.
Sequence in context: A082270 A055688 A241583 * A225879 A027957 A300569
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Apr 02 2003
EXTENSIONS
More terms from David Wasserman, Jul 16 2004
STATUS
approved

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Last modified March 28 08:02 EDT 2024. Contains 371236 sequences. (Running on oeis4.)