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A115428
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Numbers n such that the concatenation of n with n+5 gives a square.
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19
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1, 4, 20, 31, 14564, 38239, 69919, 120395, 426436, 902596, 7478020, 9090220, 6671332084, 8114264059, 8482227259, 9900250996, 2244338786836, 2490577152964, 2509440638591, 2769448208395, 7012067592220
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Also numbers n such that n concatenated with n+1 gives the product of two numbers which differ by 4.
Also numbers n such that n concatenated with n+4 gives the product of two numbers which differ by 2.
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EXAMPLE
| 14564_14569 = 38163^2.
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CROSSREFS
| Cf. A030465, A102567, A115426, A115437, A115429, A115430, A115431, A115432, A115433, A115434, A115435, A115436, A115439.
Cf. A116125, A116099, A116167, A116297, A116177, A116171, A116185, A116315.
Sequence in context: A181433 A079454 A205670 * A172624 A043880 A030002
Adjacent sequences: A115425 A115426 A115427 * A115429 A115430 A115431
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KEYWORD
| nonn,base
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AUTHOR
| Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 06 2006
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 13 2007
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