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A357896 Additive triprimes. 0
8, 44, 66, 75, 99, 116, 125, 138, 147, 165, 170, 174, 242, 246, 255, 273, 279, 282, 318, 332, 345, 354, 363, 369, 387, 404, 426, 435, 477, 507, 530, 534, 549, 561, 578, 596, 602, 606, 615, 639, 642, 651, 657, 668, 705, 710, 741, 747, 822, 873, 903, 909, 927, 938, 956, 963, 981, 1025, 1034, 1038, 1052, 1065, 1070, 1074 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Triprimes for which the sum of the digits is also a triprime.

LINKS

Table of n, a(n) for n=1..64.

EXAMPLE

75 = 3*5*5 and 5 + 7 = 12 = 2*2*3 (both are product of 3 primes).

MATHEMATICA

s = Select[Range[8, 1500], 3 == PrimeOmega[#] &]; s = Select[s, 3 == PrimeOmega[Total[IntegerDigits[#]]] &]

PROG

(PARI) istp(k) = bigomega(k)==3; \\ A014612

isok(k) = istp(k) && istp(sumdigits(k)); \\ Michel Marcus, Nov 02 2022

CROSSREFS

Cf. A007953, A014612, A046704, A118688.

Sequence in context: A044110 A044491 A178918 * A078895 A046341 A046329

Adjacent sequences: A357893 A357894 A357895 * A357897 A357898 A357899

KEYWORD

nonn,base

AUTHOR

Zak Seidov, Oct 18 2022

STATUS

approved

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Last modified February 1 17:02 EST 2023. Contains 359993 sequences. (Running on oeis4.)