A391331 - OEIS

A391331

Odd semiprimes k = p*q such that k = A325820(p,q), with p, q primes > 3, and A325820 is the carryless base-3 multiplication.

377, 403, 481, 961, 1079, 1199, 1355, 1369, 1417, 1897, 2071, 2119, 2573, 3071, 3379, 3523, 3695, 3785, 4033, 4055, 5053, 5173, 5299, 5677, 6031, 6331, 8063, 8327, 8401, 9529, 9607, 9841, 10027, 10543, 10907, 11345, 11881, 12869, 13117, 13927, 14383, 15097, 15883, 17411, 18019, 18967, 19331, 19357, 21257, 21431

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OFFSET

1,1

COMMENTS

Terms of A391332 that are not multiples of 3.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences related to carryless arithmetic.

EXAMPLE

961 = 31*31 and A007089(31) = 1011, and when doing a long multiplication of 1011 x 1011 we obtain:

1011

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