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

1,1

Links

Table of n, a(n) for n=1..44.

Formula

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

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

Example

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.

Sequence in context: A142840 A142218 A330325 * A166056 A142580 A142635

Adjacent sequences: A277457 A277458 A277459 * A277461 A277462 A277463

Keyword

nonn

Author

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

Status

approved