Four-Digit Prime Numbers by Tens (Part 7: 7000-8000)

You will be given four four-digit numbers that differ only by the last digit being 1, 3, 7, or 9. Answer which ones are prime numbers.
Example: If you are given "21, 23, 27, 29", only 23 and 29 are prime numbers, so you should choose "3, 9"
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2014MELO03
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Last updated: March 29, 2025
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First submittedMarch 29, 2025
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7551, 7553, 7557, 7559
7641, 7643, 7647, 7649
7761, 7763, 7767, 7769
7791, 7793, 7797, 7799
7811, 7813, 7817, 7819
7321, 7323, 7327, 7329
7861, 7863, 7867, 7869
7941, 7943, 7947, 7949
7541, 7543, 7547, 7549
7021, 7023, 7027, 7029
7301, 7303, 7307, 7309
7351, 7353, 7357, 7359
7191, 7193, 7197, 7199
7151, 7153, 7157, 7159
7921, 7923, 7927, 7929
7931, 7933, 7937, 7939
7441, 7443, 7447, 7449
7511, 7513, 7517, 7519
7601, 7603, 7607, 7609
7771, 7773, 7777, 7779
7341, 7343, 7347, 7349
7281, 7283, 7287, 7289
7121, 7123, 7127, 7129
7131, 7133, 7137, 7139
7871, 7873, 7877, 7879
7461, 7463, 7467, 7469
7971, 7973, 7977, 7979
7961, 7963, 7967, 7969
7041, 7043, 7047, 7049
7901, 7903, 7907, 7909
7271, 7273, 7277, 7279
7701, 7703, 7707, 7709
7331, 7333, 7337, 7339
7061, 7063, 7067, 7069
7371, 7373, 7377, 7379
7101, 7103, 7107, 7109
7571, 7573, 7577, 7579
7821, 7823, 7827, 7829
7451, 7453, 7457, 7459
7491, 7493, 7497, 7499
7391, 7393, 7397, 7399
7361, 7363, 7367, 7369
7311, 7313, 7317, 7319
7381, 7383, 7387, 7389
7611, 7613, 7617, 7619
7251, 7253, 7257, 7259
7741, 7743, 7747, 7749
7531, 7533, 7537, 7539
7851, 7853, 7857, 7859
7291, 7293, 7297, 7299
7031, 7033, 7037, 7039
7561, 7563, 7567, 7569
7911, 7913, 7917, 7919
7981, 7983, 7987, 7989
7801, 7803, 7807, 7809
7661, 7663, 7667, 7669
7881, 7883, 7887, 7889
7671, 7673, 7677, 7679
7991, 7993, 7997, 7999
7201, 7203, 7207, 7209
7621, 7623, 7627, 7629
7891, 7893, 7897, 7899
7171, 7173, 7177, 7179
7261, 7263, 7267, 7269
7591, 7593, 7597, 7599
7951, 7953, 7957, 7959
7581, 7583, 7587, 7589
7401, 7403, 7407, 7409
7501, 7503, 7507, 7509
7081, 7083, 7087, 7089
7471, 7473, 7477, 7479
7481, 7483, 7487, 7489
7691, 7693, 7697, 7699
7211, 7213, 7217, 7219
7731, 7733, 7737, 7739
7091, 7093, 7097, 7099
7751, 7753, 7757, 7759
7681, 7683, 7687, 7689
7011, 7013, 7017, 7019
7651, 7653, 7657, 7659
7231, 7233, 7237, 7239
7421, 7423, 7427, 7429
7051, 7053, 7057, 7059
7411, 7413, 7417, 7419
7631, 7633, 7637, 7639
7141, 7143, 7147, 7149
7071, 7073, 7077, 7079
7001, 7003, 7007, 7009
7241, 7243, 7247, 7249
7161, 7163, 7167, 7169
7111, 7113, 7117, 7119
7521, 7523, 7527, 7529
7181, 7183, 7187, 7189
7431, 7433, 7437, 7439
7781, 7783, 7787, 7789
7221, 7223, 7227, 7229
7831, 7833, 7837, 7839
7711, 7713, 7717, 7719
7841, 7843, 7847, 7849
7721, 7723, 7727, 7729
0none
11
13
17
19
21, 3
21, 7
21, 9
23, 7
23, 9
27, 9
31, 3, 7
31, 3, 9
31, 7, 9
33, 7, 9
4all
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