A258884 Primitive weird numbers, pwn, of the form 2^k*p*q*r*s with k > 0 and where p < q < r < s are odd primes.

4199030, 29465852, 120888092, 259858324, 260378492, 410832532, 775397948, 785187524, 903217276, 989226964, 1609445332, 2358115084, 3254323124, 3381352084, 3381872252, 3781448788, 3782267372, 5056717796, 5065605532, 5066413508, 9210347984, 9772585048, 9776437996, 9843119884

Offset

1,1

Comments

This differs from the sequence of primitive weird numbers with 5 (or 4 odd) distinct prime factors from a(54) on, the 54th number of that form being 114141404156 = 2^2 * 13^2 * 19 * 383 * 23203. - M. F. Hasler, Jul 08 2016

Links

Table of n, a(n) for n=1..24.

M. F. Hasler, Table of n, a(n) for n = 1..60

Example

a(1) = 4199030 = 2*5*11*59*647.
a(2) = 29465852 = 2^2*13*23*71*347.
a(3) = 120888092 = 2^2*13*23*61*1657.

Prog

(PARI) select(t -> factor(t)[, 2][^1]~ == [1, 1, 1, 1], A002975) \\ Assuming that A002975 is defined as vector holding enough terms of that sequence. - M. F. Hasler, Jul 08 2016

Crossrefs

Cf. A002975, A258401, A258882, A258883, A258885.

Sequence in context: A013970 A036100 A236946 * A250543 A251800 A283033

Adjacent sequences: A258881 A258882 A258883 * A258885 A258886 A258887

Keyword

nonn

Author

Douglas E. Iannucci and Robert G. Wilson v, Jun 14 2015

Extensions

Definition edited (to require p > 2) by M. F. Hasler, Jul 08 2016

Incorrect Mathematica code (allowed 114141404156) removed by M. F. Hasler, Jun 29 2016

Status

approved