A121492 Gaps associated with A002540(n).
1, 2, 3, 4, 5, 6, 8, 10, 12, 14, 20, 22, 30, 32, 34, 36, 44, 52, 72, 86, 96, 112, 114, 118, 132, 148, 154, 180, 210, 220, 222, 234, 248, 250, 282, 288, 292, 320, 336, 354, 382, 384, 394, 456, 464, 468, 474, 486, 490, 500, 514, 516, 532, 534, 540, 582, 588, 602
Offset: 1
Keywords
Examples
6 is in the sequence since 53 and 59 are consecutive prime powers and no smaller pair of consecutive prime powers differ by 6 or more. [From _Michael B. Porter_, Nov 03 2009]
Links
- Jan Kristian Haugland, Table of n, a(n) for n = 1..87 (terms 1..79 from _Donovan Johnson_). The extra terms are copied from A005250 as the associated prime gaps do not contain any prime powers.
Crossrefs
Programs
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PARI
isA000961(n) = (omega(n) == 1 || n == 1) d_max=0;n_prev=1;for(n=2,1e6,if(isA000961(n),d=n-n_prev;if(d>d_max,print(d); d_max=d);n_prev=n)) /* Michael B. Porter, Nov 01 2009 */
Extensions
Second term corrected. a(20)-a(79) and b-file from Donovan Johnson, Nov 14 2008
Comments