A088365 Local maxima of A053707 (first differences of A025475, powers of a prime but not prime).

4, 9, 17, 40, 74, 54, 151, 120, 307, 312, 199, 408, 356, 424, 912, 1032, 1217, 840, 1872, 423, 1608, 2518, 1588, 1920, 1230, 2112, 3713, 1560, 5208, 2832, 3952, 2872, 3192, 3288, 3432, 8400, 5738, 4080, 4272, 4512, 6288, 8280, 8520, 5232, 5352, 3672, 8892

Offset: 1

Author

Klaus Brockhaus, Sep 27 2003

Keywords

• nonn

Comments

A053707(k) for k = 1 is a term iff A053707(k) >= A053707(k+1); A053707(k) for k > 1 is a term iff A053707(k-1) < A053707(k) and A053707(k) >= A053707(k+1).

A088366 gives the corresponding indices. Local minima of A053707 are in A088363.

Examples

			The first six terms of A053707 are 3,4,1,7,9,2, hence A053707(2) = 4 is the first and A053707(5) = 9 is the second local maximum of A053707.
		

Crossrefs

Cf. A025475, A053707, A088366, A088363.

Programs

PARI

{m=1; k=0; for(n=2,250000,if(matsize(factor(n))[1]==1&&factor(n)[1,2]>1,d=n-m; if((k<2||b