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A087883 a(n) = PrimePi[n-PrimePi[n-1]] + Prime[Abs[n - Prime[n-2]]] 0
1, 1, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A reinversion sequence based on the primes with an A005185 pattern.

LINKS

Table of n, a(n) for n=1..52.

MATHEMATICA

prid[n_Integer?Positive] := prid[n] =PrimePi[n-PrimePi[n-1]] + Prime[Abs[n - Prime[n-2]]] prid[1] = prid[2] = 1 digits=256 a=Table[prid[n], {n, 1, digits+4}]

CROSSREFS

Cf. A005185.

Sequence in context: A215342 A146923 A256977 * A218438 A162416 A233586

Adjacent sequences:  A087880 A087881 A087882 * A087884 A087885 A087886

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Oct 12 2003

STATUS

approved

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Last modified January 18 10:53 EST 2019. Contains 319271 sequences. (Running on oeis4.)