OFFSET
1,2
COMMENTS
a(18) > 10^15 if it exists. - David A. Corneth, Aug 06 2020
From Chai Wah Wu, Aug 17 2020: (Start)
The following numbers are terms:
2805402158142975 = 153931531311*(1*5*3*9*3*1*5*3*1*3*1*1) = 111822471227*(1*1*1*8*2*2*4*7*1*2*2*7) - 1.
8748948067725824 = 2441112742111*(2*4*4*1*1*1*2*7*4*2*1*1*1) = 53339113353*(5*3*3*3*9*1*1*3*3*5*3) - 1.
(End)
LINKS
Puzzling Stackexchange, Pairs of Bogotá numbers, 2020.
EXAMPLE
n | a(n) a(n)+1
-----+------------------------------------------------------------------
1 | 0 = 0 * 0 1 = 1 * 1
2 | 24 = 12 * (1*2) 25 = 5 * 5
3 | 2510 = 251 * (2*5*1) 2511 = 93 * (9*3)
4 | 5210 = 521 * (5*2*1) 5211 = 193 * (1*9*3)
5 | 8991 = 333 * (3*3*3) 8992 = 1124 * (1*1*2*4)
6 | 56384 = 881 * (8*8*1) 56385 = 537 * (5*3*7)
7 | 348732 = 3229 * (3*2*2*9) 348733 = 7117 * (7*1*1*7)
8 | 460719 = 7313 * (7*3*1*3) 460720 = 11518 * (1*1*5*1*8)
9 | 867839 = 17711 * (1*7*7*1*1) 867840 = 5424 * (5*4*2*4)
10 | 28997919 = 119333 * (1*1*9*3*3*3) 28997920 = 51782 * (5*1*7*8*2)
CROSSREFS
KEYWORD
nonn,more,base
AUTHOR
Seiichi Manyama, Aug 06 2020
EXTENSIONS
a(11)-a(17) from David A. Corneth, Aug 06 2020
STATUS
approved