A062968 - OEIS

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A062968

n + 1 - d(n), where d(n) is the number of divisors function.

1, 1, 2, 2, 4, 3, 6, 5, 7, 7, 10, 7, 12, 11, 12, 12, 16, 13, 18, 15, 18, 19, 22, 17, 23, 23, 24, 23, 28, 23, 30, 27, 30, 31, 32, 28, 36, 35, 36, 33, 40, 35, 42, 39, 40, 43, 46, 39, 47, 45, 48, 47, 52, 47, 52, 49, 54, 55, 58, 49, 60, 59, 58, 58, 62, 59, 66, 63, 66, 63, 70, 61, 72

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OFFSET

1,3

COMMENTS

A062968 = n - A070824 [From Eric Desbiaux, Dec 10 2009]

LINKS

Table of n, a(n) for n=1..73.

FORMULA

a(n) = n+1-A000005(n) = A049820(n)-1. [From Omar E. Pol, Jul 16 2009]

MATHEMATICA

Table[n + 1 - DivisorSigma[0, n], {n, 1, 73}] (* Jean-François Alcover, Jun 24 2013 *)

PROG