A087881 a(n) = Prime[Prime[n-1]] + PrimePi[Abs[n - PrimePi[n-1]]]

4, 6, 12, 19, 33, 43, 61, 70, 86, 113, 131, 161, 183, 195, 215, 246, 282, 288, 336, 359, 373, 407, 437, 467, 516, 554, 571, 595, 607, 625, 717, 747, 782, 806, 868, 886, 928, 976, 1000, 1041, 1073, 1097, 1163, 1182, 1212, 1228, 1308, 1420, 1444, 1458, 1483

Offset

2,1

Comments

Purely functional sequence undefined for n=1 based on the primes in a reinversion pattern based on A004001.

Links

Table of n, a(n) for n=2..52.

Mathematica

prid[n_Integer?Positive] := prid[n] =Prime[Prime[n-1]] + PrimePi[Abs[n - PrimePi[n-1]]] digits=256 a=Table[prid[n], {n, 2, digits}]

Crossrefs

Cf. A004001.

Sequence in context: A027856 A048641 A023599 * A063607 A306270 A045956

Adjacent sequences: A087878 A087879 A087880 * A087882 A087883 A087884

Keyword

nonn

Author

Roger L. Bagula, Oct 12 2003

Status

approved