A277459 Decades with the same semiprime pattern as the next decade.

102, 387, 433, 436, 527, 656, 882, 1108, 1181, 1531, 1546, 1555, 1667, 1797, 1822, 1823, 1913, 1991, 2009, 2074, 2083, 2151, 2311, 2353, 2370, 2615, 2626, 2646, 2671, 3202, 3232, 3256, 3278, 3293, 3371, 3413, 3511, 3599, 3634, 3904, 3929, 3934, 4123, 4152

Offset

1,1

Links

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

Formula

a(n) = A220063(n)-2.

a(n) = A277460(n)-1.

Example

a(1)=102 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, A277460.

Sequence in context: A203407 A204867 A204860 * A127655 A206659 A206652

Adjacent sequences: A277456 A277457 A277458 * A277460 A277461 A277462

Keyword

nonn

Author

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

Status

approved