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A088240 Values associated with sequence A078511. 1
2, 12, 12, 16, 16, 18, 20, 24, 24, 24, 24, 28, 24, 24, 28, 32, 36, 36, 32, 32, 40, 36, 32, 32, 48, 48, 36, 36, 32, 48, 36, 48, 48, 32, 48, 30, 36, 48, 48, 40, 48, 36, 36, 48, 48, 40, 60, 40, 48, 48, 64, 40, 48, 48, 48, 64, 40, 48, 48, 36, 64, 48, 64, 60, 48, 48, 64, 60, 36, 48 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A000005(A078511(n)) = A001414(A078511(n)).

MATHEMATICA

s = {}; Do[If[(d = DivisorSigma[0, n]) == Total[Times @@@ FactorInteger[n]], AppendTo[s, d]], {n, 2, 100000}]; s (* Amiram Eldar, Jun 22 2019 *)

PROG

(PARI) isA078511(n) = {my(f = factor(n)); sum(i=1, #f~, f[i, 1]*f[i, 2]) == numdiv(n); }

lista(nn) = for (n=1, nn, if (isA078511(n), print1(numdiv(n), ", "))); \\ Michel Marcus, Feb 11 2015

CROSSREFS

Cf. A000005, A001414, A078511.

Sequence in context: A181060 A171446 A068515 * A168457 A045895 A251421

Adjacent sequences:  A088237 A088238 A088239 * A088241 A088242 A088243

KEYWORD

nonn

AUTHOR

Lekraj Beedassy, Nov 03 2003

EXTENSIONS

More terms from Ray Chandler, Nov 05 2003

STATUS

approved

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Last modified July 5 04:30 EDT 2020. Contains 335459 sequences. (Running on oeis4.)