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A166700 Totally multiplicative sequence with a(p) = a(p-1) + 3 for prime p. 1
1, 4, 7, 16, 19, 28, 31, 64, 49, 76, 79, 112, 115, 124, 133, 256, 259, 196, 199, 304, 217, 316, 319, 448, 361, 460, 343, 496, 499, 532, 535, 1024, 553, 1036, 589, 784, 787, 796, 805, 1216, 1219, 868, 871, 1264, 931, 1276, 1279, 1792, 961, 1444 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
Multiplicative with a(p^e) = (a(p-1)+3)^e. If n = Product p(k)^e(k) then a(n) = Product (a(p(k)-1)+3)^e(k).
MAPLE
f:= proc(n) option remember; local F, t;
F:= ifactors(n)[2];
mul((procname(t[1]-1)+3)^t[2], t = F)
end proc:
map(f, [$1..50]); # Robert Israel, Apr 05 2023
CROSSREFS
Sequence in context: A360800 A255650 A350961 * A266532 A160715 A160120
KEYWORD
nonn,mult,look
AUTHOR
Jaroslav Krizek, Oct 18 2009
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)