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A133811 Numbers that are primally tight and have strictly ascending powers. +0
4
1, 2, 3, 4, 5, 7, 8, 9, 11, 13, 16, 17, 18, 19, 23, 25, 27, 29, 31, 32, 37, 41, 43, 47, 49, 53, 54, 59, 61, 64, 67, 71, 73, 75, 79, 81, 83, 89, 97, 101, 103, 107, 108, 109, 113, 121, 125, 127, 128, 131, 137, 139, 149, 151, 157, 162, 163, 167, 169, 173, 179, 181, 191 (list; graph; listen)
OFFSET

1,2

COMMENT

All numbers of the form p_1^k1*p_2^k2*...*p_n^k_n, where k1 < k2 < ... < k_n, and the p_i are n successive primes.

Subset of A073491, A133810.

Different from A082377 starting n=16.

Different from A000961 (prime powers) starting n=13.

CROSSREFS

Cf. A025487, A087980, A073491, A133808-A133813.

Sequence in context: A087092 A046684 A082377 this_sequence A119314 A014567 A030230

Adjacent sequences: A133808 A133809 A133810 this_sequence A133812 A133813 A133814

KEYWORD

nonn

AUTHOR

Olivier Gerard (olivier.gerard(AT)gmail.com), Sep 23, 2007

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Last modified December 4 21:35 EST 2008. Contains 151309 sequences.


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