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Search: id:A072202
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A072202 Same numbers of prime factors of forms 4*k+1 and 4*k+3. +0
2
1, 2, 4, 8, 15, 16, 30, 32, 35, 39, 51, 55, 60, 64, 70, 78, 87, 91, 95, 102, 110, 111, 115, 119, 120, 123, 128, 140, 143, 155, 156, 159, 174, 182, 183, 187, 190, 203, 204, 215, 219, 220, 222, 225, 230, 235, 238, 240, 246, 247, 256, 259, 267, 280, 286, 287, 291 (list; graph; listen)
OFFSET

1,2

COMMENT

A046080(n) = A065339(n).

for all i,j exists k such that a(i)*a(j)=a(k).

EXAMPLE

825 = 3*5*5*11 = [(4*0+3)*(4*2+3)]*[(4*1+1)*(4*1+1)], therefore 825 is a term.

CROSSREFS

Cf. A002144, A002145.

Sequence in context: A084345 A084561 A078613 this_sequence A076351 A140117 A039743

Adjacent sequences: A072199 A072200 A072201 this_sequence A072203 A072204 A072205

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Jul 03 2002

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Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.


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