421538917598915629
This number is a prime.
42153891 7598915629
The largest known prime factor in "The
Octopus" (as of February 3, 2010). It occurs as a(16)
in the 7R arm:
2R
2=a(1)
22=a(2)
222=a(3)
6222=a(4)
96222=a(5)
9396222=a(6)
6279396222=a(7)
12546279396222=a(8)
148212546279396222=a(9)
300148212546279396222=a(10)
18333300148212546279396222=a(11)
3795318333300148212546279396222=a(12)
1520433795318333300148212546279396222=a(13)
5055121520433795318333300148212546279396222=a(14)
49840565055121520433795318333300148212546279396222=a(15)
2623287849840565055121520433795318333300148212546279396222=a(16)
?=a(17)
Let a(1)=2. a(n) is the smallest number > a(n-1)
containing a(n-1) as rightmost digits and having exactly
n distinct prime factors.Can you find the next term?
Honaker: a(1)-a(4) Gupta: a(5)-a(14) Andersen: a(15)-a(16)2L
a(1)=2 a(2)=21 a(3)=2109 a(4)=21098 a(5)=2109822 a(6)=2109822078 a(7)=2109822078054 a(8)=2109822078054306 a(9)=2109822078054306590 a(10)=21098220780543065904030 a(11)=2109822078054306590403010890 a(12)=210982207805430659040301089001530 a(13)=21098220780543065904030108900153044430 a(14)=?Let a(1)=2. a(n) is the smallest number > a(n-1) containing a(n-1) as leftmost digits and having exactly n distinct prime factors.
Can you find the next term?
Honaker: a(1)-a(4) Gupta: a(5)-a(13)3R
3=a(1)
33=a(2)
1533=a(3)
491533=a(4)
112491533=a(5)
319112491533=a(6)
393319112491533=a(7)
964393319112491533=a(8)
15905964393319112491533=a(9)
598515905964393319112491533=a(10)
16359598515905964393319112491533=a(11)
2217916359598515905964393319112491533=a(12)
3026852217916359598515905964393319112491533=a(13)
11875083026852217916359598515905964393319112491533=a(14)
340161911875083026852217916359598515905964393319112491533=a(15)
73778782340161911875083026852217916359598515905964393319112491533=a(16)
?=a(17)
Let a(1)=3. a(n) is the smallest number > a(n-1)
containing a(n-1) as rightmost digits and having exactly
n distinct prime factors.Can you find the next term?
Honaker: a(1)-a(4) Gupta: a(5)-a(13) Andersen: a(14)-a(16)3L
a(1)=3 a(2)=33 a(3)=3302 a(4)=33022 a(5)=3302222 a(6)=330222230 a(7)=330222230030 a(8)=330222230030055 a(9)=330222230030055935 a(10)=3302222300300559358065 a(11)=330222230030055935806507470 a(12)=33022223003005593580650747061518 a(13)=33022223003005593580650747061518135430 a(14)=?Let a(1)=3. a(n) is the smallest number > a(n-1) containing a(n-1) as leftmost digits and having exactly n distinct prime factors.
Can you find the next term?
Honaker: a(1)-a(4) Gupta: a(5)-a(13)5R
5=a(1)
15=a(2)
615=a(3)
18615=a(4)
5718615=a(5)
1055718615=a(6)
1291055718615=a(7)
911291055718615=a(8)
3333911291055718615=a(9)
2183333911291055718615=a(10)
177872183333911291055718615=a(11)
51415177872183333911291055718615=a(12)
1293551415177872183333911291055718615=a(13)
2250601293551415177872183333911291055718615=a(14)
74586822250601293551415177872183333911291055718615=a(15)
574883974586822250601293551415177872183333911291055718615=a(16)
?=a(17)
Let a(1)=5. a(n) is the smallest number > a(n-1)
containing a(n-1) as rightmost digits and having exactly
n distinct prime factors.Can you find the next term?
Honaker: a(1)-a(4) Gupta: a(5)-a(14) Andersen: a(15), a(16)5L
a(1)=5 a(2)=51 a(3)=518 a(4)=5187 a(5)=518738 a(6)=518738066 a(7)=518738066022 a(8)=518738066022891 a(9)=5187380660228910138 a(10)=51873806602289101381770 a(11)=5187380660228910138177036634 a(12)=51873806602289101381770366340485 a(13)=51873806602289101381770366340485096495 a(14)=?Let a(1)=5. a(n) is the smallest number > a(n-1) containing a(n-1) as leftmost digits and having exactly n distinct prime factors.
Can you find the next term?
Honaker: a(1)-a(4) Gupta: a(5)-a(13)7R
7=a(1)
57=a(2)
357=a(3)
51357=a(4)
3451357=a(5)
1193451357=a(6)
6391193451357=a(7)
20466391193451357=a(8)
699320466391193451357=a(9)
20508699320466391193451357=a(10)
3802320508699320466391193451357=a(11)
5990603802320508699320466391193451357=a(12)
7950455990603802320508699320466391193451357=a(13)
8621077950455990603802320508699320466391193451357=a(14)
108013858621077950455990603802320508699320466391193451357=a(15)
11428690108013858621077950455990603802320508699320466391193451357=a(16)
?=a(17)
Let a(1)=7. a(n) is the smallest number > a(n-1)
containing a(n-1) as rightmost digits and having exactly
n distinct prime factors.Can you find the next term?
Honaker: a(1)-a(4) Gupta: a(5)-a(13) Andersen: a(14)-a(16)7L
a(1)=7 a(2)=74 a(3)=741 a(4)=74102 a(5)=7410255 a(6)=741025545 a(7)=741025545195 a(8)=741025545195705 a(9)=7410255451957051086 a(10)=741025545195705108602109 a(11)=7410255451957051086021092590 a(12)=741025545195705108602109259078965 a(13)=74102554519570510860210925907896578105 a(14)=?Let a(1)=7. a(n) is the smallest number > a(n-1) containing a(n-1) as leftmost digits and having exactly n distinct prime factors.
Can you find the next term?
Honaker: a(1)-a(4) Gupta: a(5)-a(13)
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