Search a number
deficient n.  and  undulating n.

First numbers that belong to both sets:

101, 121, 131, 141, 151, 161, 171, 181, 191, 202, 212, 232, 242, 262, 292, 303, 313, 323, 343, 353, 363, 373, 383, 393, 404, 424, 434, 454, 484, 494, 505, 515, 525, 535, 545, 565, 575, 585, 595, 626, 646, 656, 676, 686, 707, 717, 727, 737, 747, 757, 767, 787, 797, 808, 818, 838, 848, 878, 898, 909, 919, 929, 939, 949, 959, 969, 979, 989, 1010, 1313, 1414, 1515, 1616, 1717, 1919, 2121, 2323, 2525, 2626, 2727, 2929, 3131, 3232, 3434, 3535, 3737, 3838, 3939, 4141, 4343, 4545, 4646, 4747, 4949, 5050, 5151, 5252, 5353, 5757, 5858, 5959, 6161, 6262, 6363, 6565, 6767, 6868, 6969, 7171, 7373, 7474, 7575, 7676, 7979, 8181, 8282, 8383, 8585, 8686, 8787, 8989, 9191, 9292, 9393, 9494, 9595, 9797, 9898, 10101, 12121, 13131, 14141, 15151, 16161, 17171, 18181, 19191, 21212, 24242, 25252, 28282, 30303, 31313, 32323, 34343, 35353, 36363, 37373, 38383, 39393, 41414, 42424, 45454, 47474, 48484, 51515, 52525, 53535, 54545, 56565, 57575, 58585, 59595, 61616, 62626, 64646, 65656, 68686, 70707, 71717, 72727, 73737, 74747, 75757, 76767, 78787, 79797, 81818, 82828, 84848, 85858, 87878, 90909, 91919, 92929, 93939, 94949, 95959, 96969, 97979, 98989, 131313, 171717, 191919, 212121, 232323, 272727, 292929, 313131, 373737, 393939, 414141, 434343, 474747, 494949, 515151, 535353, 575757, 595959, 616161, 636363, 676767, 696969, 717171, 737373, 797979, 818181, 838383, 878787, 898989, 919191, 939393, 979797, 1010101, 1212121, 1313131, 1414141, 1515151, 1616161, 1717171, 1818181, 1919191, 2020202, 2121212, 2323232, 2424242, 2525252, 2626262, 2727272, 2828282, 2929292, 3030303, 3131313, 3232323, 3434343, 3535353, 3636363, 3737373, 3838383, 3939393, 4040404, 4141414, 4242424, 4343434, 4545454, 4747474, 4848484, 4949494, 5050505, 5151515, 5252525, 5353535, 5454545, 5656565, 5757575, 5858585, 5959595, 7070707, 7171717, 7272727, 7373737, 7474747, 7575757, 7676767, 7878787, 7979797, 8080808, 8181818, 8282828, 8383838, 8484848, 8585858, 8686868, 8787878, 8989898, 9090909, 9191919, 9292929, 9393939, 9494949, 9595959, 9696969, 9797979, 9898989.