A277460 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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.