A161356 Pronic numbers A002378 (AA) that can be divided into two equal strings (A).

132132, 406406, 510510, 852852, 79307930, 6694266942, 113322113322, 440056440056, 52892565289256, 5847751058477510, 111333222111333222, 164378892164378892, 183673470183673470, 200444410200444410, 206611570206611570, 224376732224376732, 277008310277008310, 297520662297520662

Offset: 1

Author

Claudio Meller, Jun 07 2009

Keywords

• nonn
• base

Examples

			132132 = 363 x 364 and can be divided into two equal strings (132), so it is a term.
406406 = 637 x 638, 510510 = 714 x 715, 852852 = 923 x 924, 79307930 = 8905 x 8906 are terms.
		

Crossrefs

Cf. A116285.

Formula

a(n) = A116285(n)*(A116285(n)+1). - Michael S. Branicky, Jul 11 2025

Extensions

a(6)-a(14) from Donovan Johnson, Jun 15 2009

a(15)-a(18) from Michael S. Branicky, Jul 11 2025 using A116285