A128705 Numbers of the form 7^k*p, where 1 <= k <= 4 and p is a prime different from 7.

14, 21, 35, 77, 91, 98, 119, 133, 147, 161, 203, 217, 245, 259, 287, 301, 329, 371, 413, 427, 469, 497, 511, 539, 553, 581, 623, 637, 679, 686, 707, 721, 749, 763, 791, 833, 889, 917, 931, 959, 973, 1029, 1043, 1057, 1099, 1127, 1141, 1169, 1211, 1253, 1267

Offset

1,1

Comments

Auxiliary sequence for A128706 which gives the number of groups of order a(n).

Links

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

Example

931 = 7^2*19 is a term.

Prog

(Magma) [ n: n in [1..1300] | #t eq 2 and ((t[1, 1] lt 7 and t[1, 2] eq 1 and t[2, 1] eq 7 and t[2, 2] le 4) or (t[1, 1] eq 7 and t[1, 2] le 4 and t[2, 2] eq 1)) where t is Factorization(n) ];

Crossrefs

Cf. A128706, A000420 (powers of 7).

Sequence in context: A258217 A272470 A094393 * A073250 A335760 A159453

Adjacent sequences: A128702 A128703 A128704 * A128706 A128707 A128708

Keyword

nonn

Author

Klaus Brockhaus, Mar 26 2007

Status

approved