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Table of n, a(n) for n=1..74.
14 = 2^1*7^1, a(14)=2*7+1*1=15.
Sum of A007947 and A005361.
Sequence in context: A178993 A193768 A205791 * A076332 A245092 A092601
Adjacent sequences: A039693 A039694 A039695 * A039697 A039698 A039699