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 A193413 Valley numbers. 4
 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33, 44, 55, 66, 77, 88, 99, 101, 111, 202, 212, 222, 303, 313, 323, 333, 404, 414, 424, 434, 444, 505, 515, 525, 535, 545, 555, 606, 616, 626, 636, 646, 656, 666, 707, 717, 727, 737, 747, 757, 767, 777, 808, 818, 828, 838, 848, 858, 868, 878, 888, 909, 919, 929, 939, 949, 959, 969, 979, 989, 999, 1001 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS For n > 10 the structure of digits represents a valley. The first digit is equal to the last digit (1 - 9). The first digits are in nonincreasing order. The last digits are in nondecreasing order. The numbers may have more than one smallest digit. Sequence is infinite. Superset of crater numbers (A193409) and A193412. See valley numbers in base 2 (A193414 and A193415). LINKS Table of n, a(n) for n=1..73. EXAMPLE Illustration using 6543333346: 6 . . . . . . . . 6 . 5 . . . . . . . . . . 4 . . . . . 4 . . . . 3 3 3 3 3 . . CROSSREFS Cf. A110785, A193409, A193412, A193414, A193415. Cf. A134970. - Omar E. Pol, Aug 05 2011 Sequence in context: A276354 A084982 A110785 * A087992 A062687 A109882 Adjacent sequences: A193410 A193411 A193412 * A193414 A193415 A193416 KEYWORD nonn,base AUTHOR Jaroslav Krizek, Jul 25 2011 EXTENSIONS More terms extended by definition by Jaroslav Krizek, Jul 27 2011 STATUS approved

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Last modified August 10 00:01 EDT 2024. Contains 375044 sequences. (Running on oeis4.)