Semiprimes m = p*q where m, p and q are in A033638 (locations of right angle turns in Ulam square spiral).

A331997

Semiprimes m = p*q where m, p and q are in A033638 (locations of right angle turns in Ulam square spiral).

Terms

    a(0) =10a(1) =21a(2) =26a(3) =65a(4) =91a(5) =111a(6) =785a(7) =842a(8) =1333a(9) =4097a(10) =21171a(11) =28562a(12) =50851a(13) =100807a(14) =194923a(15) =970226a(16) =1000001a(17) =37021141a(18) =65618101a(19) =81144065a(20) =151782401a(21) =151819363a(22) =174134417a(23) =577921601a(24) =688773781a(25) =796622401a(26) =796678851a(27) =1276025563a(28) =2090501285a(29) =2176782337

External references