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x
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x is prime x is composite
x is even x is odd
P Show primes FF Show fully factored numbers
PRP Show probable primes CF Show incompletely factored numbers
U Show numbers with unknown state C Show composites without known factors
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status (?) x digits number
FF 1 2 51 = 3 · 17
FF 2 3 511 = 7 · 73
FF 3 4 5111 = 19 · 269
FF 4 5 51111 = 3^4 · 631
P 5 6 511111 = 511111
FF 6 7 5111111 = 59 · 86629
FF 7 8 51111111 = 3 · 17037037
FF 8 9 511111111 = 7^2 · 10430839
FF 9 10 5111111111<10> = 79 · 64697609
FF 10 11 51111111111<11> = 3 · 53 · 73 · 4403473
FF 11 12 511111111111<12> = 313 · 4447 · 367201
P 12 13 5111111111111<13> = 5111111111111<13>
FF 13 14 51111111111111<14> = 3^2 · 1987 · 4019 · 711143
FF 14 15 511111111111111<15> = 7 · 73015873015873<14>
P 15 16 5111111111111111<16> = 5111111111111111<16>
FF 16 17 51111111111111111<17> = 3 · 149 · 114342530449913<15>
FF 17 18 511111111111111111<18> = 17 · 30065359477124183<17>
FF 18 19 5111111111111111111<19> = 73 · 109 · 181 · 3548847924383<13>
FF 19 20 51111111111111111111<20> = 3 · 11131 · 49201 · 31108993127<11>
FF 20 21 511111111111111111111<21> = 7 · 743 · 64747 · 461479 · 3288947
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