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Search: id:A074985
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| A074985 |
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Squares of semiprimes A001358, composite numbers divisible by exactly 2 primes (counted with multiplicity). |
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+0
5
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| 16, 36, 81, 100, 196, 225, 441, 484, 625, 676, 1089, 1156, 1225, 1444, 1521, 2116, 2401, 2601, 3025, 3249, 3364, 3844, 4225, 4761, 5476, 5929, 6724, 7225, 7396, 7569, 8281, 8649, 8836, 9025, 11236, 12321, 13225, 13924, 14161, 14641, 14884, 15129
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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4 is divisible by 2 (twice) and 4*4=16, 6 is divisible by exactly 2 and 6 and 6*6=36...
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MAPLE
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readlib(issqr): ts_kv_sp := proc(n); if (numtheory[bigomega](n)=4 and issqr(n)='true') then RETURN(n); fi; end: seq(ts_kv_sp(i), i=1..50000);
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CROSSREFS
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Cf. A001358.
Sequence in context: A125240 A050775 A022040 this_sequence A069262 A076956 A075369
Adjacent sequences: A074982 A074983 A074984 this_sequence A074986 A074987 A074988
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KEYWORD
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base,easy,nonn
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AUTHOR
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Jani Melik (jani_melik(AT)hotmail.com), Oct 07 2002
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