A277460 Decades with the same semiprime pattern as the previous decade.

103, 388, 434, 437, 528, 657, 883, 1109, 1182, 1532, 1547, 1556, 1668, 1798, 1823, 1824, 1914, 1992, 2010, 2075, 2084, 2152, 2312, 2354, 2371, 2616, 2627, 2647, 2672, 3203, 3233, 3257, 3279, 3294, 3372, 3414, 3512, 3600, 3635, 3905, 3930, 3935, 4124, 4153

Offset: 1

Author

Bobby Jacobs and N. J. A. Sloane, Oct 16 2016

Keywords

• nonn

Examples

			a(1)=103 because the decade from 1020 to 1029 has the same semiprime pattern as the decade from 1030 to 1039 (1027 and 1037).
		

Crossrefs

Cf. A220063, A277459.

Formula

a(n) = A220063(n)-1.

a(n) = A277459(n)+1.