1,1

Subsequence of A100368 (numbers of the form 2^k*p, where k>0 and p is an odd prime); 1536 = 2^9*3 is the smallest term of A100368 that is not in the present sequence.

Auxiliary sequence for A128645 which gives the number of groups of order a(n).

K. Brockhaus, Table of n, a(n) for n=1..10000

40 = 2^3*5 is a term.

(MAGMA) [ n: n in [1..225] | #t eq 2 and t[1, 1] eq 2 and t[1, 2] le 8 and t[2, 2] eq 1 where t is Factorization(n) ];

Cf. A100368, A128645.

Adjacent sequences: A128688 A128689 A128690 this_sequence A128692 A128693 A128694

Sequence in context: A088829 A036348 A100368 this_sequence A028919 A015921 A134620

nonn

Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Mar 21 2007