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Vampiri doppi (numeri)

Rappresentazione dei numeri 

Si chiamano numeri vampiri doppi i numeri vampiri, i cui generatori sono anch’essi vampiri.

 

I numeri vampiri doppi fino a 16 cifre sono (M. Fiorentini, 2020):

1047527295416280 = 25198740 • 41570622 = (2940 • 8571) • (5601 • 7422),

1076673858416352 = 17562384 • 61305678 = (2751 • 6384) • (7563 • 8106),

1098538899432975 = 18940383 • 57999825 = (3801 • 4983) • (5925 • 9789),

1143559484262468 = 29561454 • 38684142 = (4251 • 6954) • (4482 • 8631),

1152735619859280 = 13225518 • 87159960 = (2538 • 5211) • (8751 • 9960),

1171599438895326 = 12519846 • 93579381 = (2511 • 4986) • (9513 • 9837),

1195276924984320 = 21984210 • 54369792 = (2241 • 9810) • (5472 • 9936),

1197649773803952 = 16993872 • 70475391 = (1932 • 8796) • (7413 • 9507),

1339567568619120 = 26183376 • 51160995 = (3126 • 8376) • (5619 • 9105),

1421673409385946 = 32946714 • 43150689 = (3417 • 9642) • (5361 • 8049),

1481978238269760 = 18239760 • 81249876 = (2310 • 7896) • (8628 • 9417),

1493756052381450 = 35842950 • 41675031 = (4290 • 8355) • (5631 • 7401),

1518032964672000 = 21365820 • 71049600 = (3282 • 6510) • (7401 • 9600),

1534898920676751 = 18726057 • 81965943 = (2751 • 6807) • (8493 • 9651),

1589792320705644 = 37056492 • 42901857 = (5973 • 6204) • (5091 • 8427),

1633297847964120 = 19464237 • 83912760 = (2613 • 7449) • (8730 • 9612),

1725986851099200 = 19802520 • 87159960 = (2010 • 9852) • (8751 • 9960),

1780471969526250 = 26190450 • 67981725 = (4290 • 6105) • (7617 • 8925),

1786341047193549 = 41397741 • 43150689 = (4371 • 9471) • (5361 • 8049),

1798526420334189 = 25441983 • 70691283 = (4281 • 5943) • (7683 • 9201),

1877944936266000 = 27966834 • 67149000 = (3849 • 7266) • (7461 • 9000),

1912095195568740 = 20851740 • 91699551 = (4020 • 5187) • (9561 • 9591),

1946509189812000 = 21651480 • 89901900 = (4110 • 5268) • (9081 • 9900),

1948356026527680 = 25680312 • 75869640 = (3012 • 8526) • (7854 • 9660),

1999842093627300 = 24691329 • 80993700 = (2649 • 9321) • (8709 • 9300),

2356903978661232 = 32196528 • 73203669 = (3528 • 9126) • (7623 • 9603),

2361660998108544 = 39624408 • 59601168 = (4362 • 9084) • (6501 • 9168),

2413858979664000 = 34619805 • 69724800 = (3681 • 9405) • (7200 • 9684),

2473465423830912 = 33236154 • 74420928 = (5334 • 6231) • (8247 • 9024),

2733137965044900 = 39470130 • 69245730 = (4371 • 9030) • (7365 • 9402),

2787608965564800 = 49027680 • 56857860 = (6984 • 7020) • (6558 • 8670),

2803809057767424 = 37675008 • 74420928 = (5376 • 7008) • (8247 • 9024),

3248596160960760 = 50789106 • 63962460 = (5706 • 8901) • (6642 • 9630),

3680699314057920 = 59394060 • 61970832 = (6534 • 9090) • (6831 • 9072),

6993981817136145 = 81193671 • 86139495 = (8361 • 9711) • (8931 • 9645).

 

Se però escludiamo dai termini del prodotto i numeri vampiri formati aggiungendo zeri agli pseudovampiri, a rigore non considerati come numeri vampiri, l’elenco si riduce e restano solo i seguenti numeri:

1076673858416352 = 17562384 • 61305678 = (2751 • 6384) • (7563 • 8106),

1098538899432975 = 18940383 • 57999825 = (3801 • 4983) • (5925 • 9789),

1143559484262468 = 29561454 • 38684142 = (4251 • 6954) • (4482 • 8631),

1171599438895326 = 12519846 • 93579381 = (2511 • 4986) • (9513 • 9837),

1197649773803952 = 16993872 • 70475391 = (1932 • 8796) • (7413 • 9507),

1339567568619120 = 26183376 • 51160995 = (3126 • 8376) • (5619 • 9105),

1421673409385946 = 32946714 • 43150689 = (3417 • 9642) • (5361 • 8049),

1534898920676751 = 18726057 • 81965943 = (2751 • 6807) • (8493 • 9651),

1589792320705644 = 37056492 • 42901857 = (5973 • 6204) • (5091 • 8427),

1786341047193549 = 41397741 • 43150689 = (4371 • 9471) • (5361 • 8049),

1798526420334189 = 25441983 • 70691283 = (4281 • 5943) • (7683 • 9201),

2356903978661232 = 32196528 • 73203669 = (3528 • 9126) • (7623 • 9603),

2361660998108544 = 39624408 • 59601168 = (4362 • 9084) • (6501 • 9168),

2473465423830912 = 33236154 • 74420928 = (5334 • 6231) • (8247 • 9024),

2803809057767424 = 37675008 • 74420928 = (5376 • 7008) • (8247 • 9024),

6993981817136145 = 81193671 • 86139495 = (8361 • 9711) • (8931 • 9645).

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