COOKIE CONSENT: By continuing to browse my site you agree to its use of cookies. OK or Tell me more
Search a number
Duffinian n.  and  pancake n.

First numbers that belong to both sets:

4, 16, 121, 301, 407, 497, 529, 667, 781, 1177, 1379, 1541, 1771, 2279, 2629, 3161, 3241, 3487, 3829, 4096, 4187, 4279, 5357, 5461, 5887, 6671, 6787, 7141, 7261, 7627, 7751, 8129, 8257, 9317, 9731, 10297, 10441, 11477, 11629, 12091, 12247, 12881, 13531, 14707, 15577, 16291, 16837, 17767, 17956, 18337, 18529, 19111, 19307, 19901, 20911, 22579, 23437, 24311, 25201, 25879, 26797, 27029, 27731, 28681, 29647, 29891, 30629, 30877, 31879, 32641, 32897, 33671, 34717, 35779, 36047, 37129, 38227, 39061, 40187, 41329, 42779, 43957, 45151, 46057, 46361, 48517, 48829, 49771, 51041, 52327, 52651, 53957, 54947, 55279, 56281, 57631, 57971, 60379, 61777, 63191, 64981, 67529, 67897, 69007, 72011, 72391, 73537, 73921, 75467, 76637, 78211, 80201, 81407, 81811, 83029, 85079, 86321, 86737, 89677, 90101, 94831, 98791, 100577, 101927, 102379, 103741, 104197, 105571, 107417, 109747, 111157, 111629, 113527, 114961, 115441, 116887, 118829, 119317, 120787, 121279, 123257, 124751, 125251, 128779, 131329, 132871, 134941, 137027, 137551, 139129, 139657, 141247, 141779, 143381, 143917, 146071, 148241, 149879, 154847, 158767, 159331, 161029, 161597, 163879, 166177, 170237, 170821, 172579, 173167, 174937, 175529, 177311, 179701, 184529, 186967, 187579, 191891, 195001, 201931, 205121, 207047, 207691, 209629, 212879, 214841, 217471, 220117, 220781, 223447, 228151, 228827, 231541, 233587, 237017, 242557, 245351, 247457, 250987, 253117, 253829, 258841, 259561, 261727, 262451, 264629, 265357, 267547, 268279, 270481, 273431, 276397, 277141, 279379, 280127, 283129, 285391, 286147, 288421, 291467, 295297, 298379, 300701, 301477, 303811, 304591, 306937, 307721, 310079, 313237, 314029, 316411, 317207, 323611, 326029, 326837, 330079, 332521, 335791, 336611, 339077, 339901, 343207, 345697, 349031, 349867, 355747, 359977, 362527, 366797, 369371, 370231, 373681, 376279, 379757, 383251, 384127, 386761, 390287, 393829, 397387, 398279, 400961, 401857, 404551, 405451, 408157, 409061, 412687, 415417, 416329, 419071, 419987, 422741, 430129, 434779, 437581, 441331, 449827, 452677, 453629.

Some larger examples :