Integers k such that the k-th triangular number t_k has all its base-12 digits contained in {1,5,7,11}.

A118711

Integers k such that the k-th triangular number t_k has all its base-12 digits contained in {1,5,7,11}.

Terms

    a(0) =1a(1) =13a(2) =61a(3) =82a(4) =898a(5) =2962a(6) =2989a(7) =9133a(8) =20077a(9) =20653a(10) =28669a(11) =29266a(12) =35581a(13) =35842a(14) =37501a(15) =99133a(16) =236674a(17) =286717a(18) =424621a(19) =424957a(20) =821698a(21) =941650a(22) =1704301a(23) =1722370a(24) =2978413a(25) =3328258a(26) =4494466a(27) =10022317a(28) =40392829a(29) =49870141

External references