Indices of pentagonal pyramidal numbers which are the sum of two other such numbers: k such that A002411(k) = A002411(i)+A002411(j) for some i,j>0.

A172437

Indices of pentagonal pyramidal numbers which are the sum of two other such numbers: k such that A002411(k) = A002411(i)+A002411(j) for some i,j>0.

Terms

    a(0) =42a(1) =82a(2) =171a(3) =411a(4) =522a(5) =886a(6) =1042a(7) =1066a(8) =1183a(9) =1341a(10) =2596a(11) =2842a(12) =3480a(13) =3831a(14) =5012a(15) =5316a(16) =5360a(17) =5786a(18) =6219a(19) =6650a(20) =6924a(21) =8406a(22) =8666a(23) =9408a(24) =10707a(25) =11735a(26) =12590a(27) =12891a(28) =14422a(29) =14646

External references