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A116163
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Numbers n such that n concatenated with n+1 gives the product of two numbers which differ by 1.
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7
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1, 5, 61, 65479, 84289, 106609, 225649, 275599, 453589, 1869505, 2272555, 2738291, 3221951, 1667833021, 2475062749, 2525062249, 3500010739, 9032526511, 9225507211, 1753016898055, 1860598847399, 3233666953849
(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 3.
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EXAMPLE
| 1 is a member since 12 = 3*4; also 10 = 2*5.
5 is a member since 56 = 7*8; also 54 = 6*9.
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CROSSREFS
| Cf. A116154, A115426, A116170, A116294.
Cf. A116143, A102567, A116112, A116130, A116280.
Sequence in context: A000364 A159316 A201254 * A092823 A152031 A111387
Adjacent sequences: A116160 A116161 A116162 * A116164 A116165 A116166
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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 15 2007, Jun 27 2009
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