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A057602
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a(1)=2, a(n+1) is the smallest integer > a(n) such that the smallest prime factor of a(n+1) is the largest prime factor of a(n).
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2
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2, 4, 6, 9, 15, 25, 35, 49, 77, 121, 143, 169, 221, 289, 323, 361, 437, 529, 667, 841, 899, 961, 1147, 1369, 1517, 1681, 1763, 1849, 2021, 2209, 2491, 2809, 3127, 3481, 3599, 3721, 4087, 4489, 4757, 5041, 5183, 5329, 5767, 6241, 6557, 6889, 7387, 7921
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| Even numbered terms are squares of successive primes. Odd numbered terms are the product of two successive primes and are the square root of the product of the previous term and the next term - Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Oct 07 2000
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CROSSREFS
| Cf. A000040.
A033476.
Sequence in context: A024787 A076922 A157679 * A171646 A006498 A074677
Adjacent sequences: A057599 A057600 A057601 * A057603 A057604 A057605
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KEYWORD
| nonn
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AUTHOR
| G. L. Honaker, Jr. (honak3r(AT)gmail.com), Oct 07 2000
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EXTENSIONS
| Additional terms from Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Oct 07 2000
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